Trees from Seminars 41 to 50
By Len Phillips
Go directly to the tree information by clicking on the title below
The following 10 trees from previous Seminars have been written with information gathered from personal observations of the author, living in Massachusetts, Zone 6, and information provided by J. Frank Schmidt & Son.
Crescendo Sugar Maple
‘Crescendo™’ Sugar Maple is a beautiful tree well suited for urban sites. It has good disease resistance, dark green leaves, and a broad oval form.
Trade Name: ‘Crescendo™’ Sugar Maple
Botanical Name: Acer saccharum ‘Morton'
Parentage: Chance seedling from northern Illinois, selected by Morton Arboretum
Family: Aceraceae
Year of Introduction: 1995
Height: 45'
Spread: 40'
Form: Broad oval form
Bloom Period: Before leaves in April
Flower: Greenish yellow, 1/4" across
Fruit: Samara
Summer Foliage: Dark green in summer to orange, heat-resistant, great variation in
autumn
Autumn Foliage: Red and orange-red fall color
Winter Color: Bark provides winter interest
Bark: Gray brown, thick plates with age
Habitat: East coast and US Southeast to Texas
Culture: Prefers well-drained acid soil, tolerates light shade and heat
Hardiness Zone: 4 – 8
Growth Rate: Slow, full size in 45 – 60 years
Pest Resistance: Better than the species
Storm Resistance: Excellent
Salt Resistance: Fair
Planting: B&B or bare root, not suitable for CU-Structural Soil planting
Pruning: Do not prune in early spring
Propagating: Budded onto species understock
Design Uses: Small tree makes a good street tree
Companions: Mulch is the best ground cover under maples
Other Comments: Very tough urban tree
Available from: Difficult to find in retail nurseries, look in the largest wholesale nurseries
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Crescendo Sugar Maple
‘Crescendo™’ Sugar Maple is a beautiful tree well suited for urban sites. It has good disease resistance, dark green leaves, and a broad oval form.
Trade Name: ‘Crescendo™’ Sugar Maple
Botanical Name: Acer saccharum ‘Morton'
Parentage: Chance seedling from northern Illinois, selected by Morton Arboretum
Family: Aceraceae
Year of Introduction: 1995
Height: 45'
Spread: 40'
Form: Broad oval form
Bloom Period: Before leaves in April
Flower: Greenish yellow, 1/4" across
Fruit: Samara
Summer Foliage: Dark green in summer to orange, heat-resistant, great variation in
autumn
Autumn Foliage: Red and orange-red fall color
Winter Color: Bark provides winter interest
Bark: Gray brown, thick plates with age
Habitat: East coast and US Southeast to Texas
Culture: Prefers well-drained acid soil, tolerates light shade and heat
Hardiness Zone: 4 – 8
Growth Rate: Slow, full size in 45 – 60 years
Pest Resistance: Better than the species
Storm Resistance: Excellent
Salt Resistance: Fair
Planting: B&B or bare root, not suitable for CU-Structural Soil planting
Pruning: Do not prune in early spring
Propagating: Budded onto species understock
Design Uses: Small tree makes a good street tree
Companions: Mulch is the best ground cover under maples
Other Comments: Very tough urban tree
Available from: Difficult to find in retail nurseries, look in the largest wholesale nurseries
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Accolade Elm
Accolade™ Elm – Ulmus 'Morton' is resistant to Dutch Elm Disease and Elm Yellows, and highly resistant to the Elm Leaf Beetle.
Trade Name: Accolade™ Elm
Botanical Name: Ulmus ‘Morton'
Parentage: U. japonica x U. wilsoniana
Family: Ulmaceae
Year of Seed Development: 1924
Year of Introduction: 1996
Height: 50’ to 60’
Spread: 30’ to 40’
Form: Upright spreading habit
Bloom Period: March
Flower: Inconspicuous
Fruit: Round samara
Summer Foliage: Dark green in summer
Autumn Foliage: Bright gold in autumn
Winter Color: Bark provides winter interest
Bark: Furrowed gray bark
Habitat: Tolerates most soils, pH, and environmental salt
Culture: Prefers rich, moist soil, well drained
Hardiness Zone: 5 – 8
Growth Rate: Fast, over 3’ per year in youth, 45' in 20 years
Pest Resistance: Resistant to Dutch Elm Disease and Elm Yellows, highly resistant to the
Elm Leaf Beetle
Storm Resistance: Good
Salt Resistance: Tolerant
Planting: Easily transplanted bare root or B&B, suitable for use in CU-Structural
Soil, quickly recovers from transplanting
Pruning: Prune in late winter after the threat of extreme cold has passed
Propagating: Own roots with tissue culture and by grafting onto Ulmus pumila
rootstock
Design Uses: Good for homes, streets, parks, and commercial landscapes
Companions: Looks good with most general landscape plants
Other Comments: Fast growing tree which has a distinctly native look
Available: Most large nurseries
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Accolade™ Elm – Ulmus 'Morton' is resistant to Dutch Elm Disease and Elm Yellows, and highly resistant to the Elm Leaf Beetle.
Trade Name: Accolade™ Elm
Botanical Name: Ulmus ‘Morton'
Parentage: U. japonica x U. wilsoniana
Family: Ulmaceae
Year of Seed Development: 1924
Year of Introduction: 1996
Height: 50’ to 60’
Spread: 30’ to 40’
Form: Upright spreading habit
Bloom Period: March
Flower: Inconspicuous
Fruit: Round samara
Summer Foliage: Dark green in summer
Autumn Foliage: Bright gold in autumn
Winter Color: Bark provides winter interest
Bark: Furrowed gray bark
Habitat: Tolerates most soils, pH, and environmental salt
Culture: Prefers rich, moist soil, well drained
Hardiness Zone: 5 – 8
Growth Rate: Fast, over 3’ per year in youth, 45' in 20 years
Pest Resistance: Resistant to Dutch Elm Disease and Elm Yellows, highly resistant to the
Elm Leaf Beetle
Storm Resistance: Good
Salt Resistance: Tolerant
Planting: Easily transplanted bare root or B&B, suitable for use in CU-Structural
Soil, quickly recovers from transplanting
Pruning: Prune in late winter after the threat of extreme cold has passed
Propagating: Own roots with tissue culture and by grafting onto Ulmus pumila
rootstock
Design Uses: Good for homes, streets, parks, and commercial landscapes
Companions: Looks good with most general landscape plants
Other Comments: Fast growing tree which has a distinctly native look
Available: Most large nurseries
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Armstrong Red Maple
Armstrong Red Maple is a tall, narrow, fast growing tree well suited for urban sites. It has good disease resistance, and light green leaves.
Trade Name: Armstrong Red Maple
Botanical Name: Acer rubrum 'Armstrong'
Parentage: A. x freemanii that is often sold as A. rubrum
Family: Aceraceae
Height: 45' - 50'
Spread: 15' – 20'
Form: Narrow, fastigiate
Bloom Period: Very early in the spring
Flower: Red, profuse, produces both male and female flowers
Fruit: Winged, bright red samaras
Summer Foliage: Light green and glossy, similar in size to a red maple but shaped like a
silver maple leaf
Autumn Foliage: Yellow to orange-red occasionally, usually dull
Winter Color: Silvery color for winter interest
Bark: Silvery gray, easily damaged thin bark
Habitat: Native to entire east coast, west to the Mississippi River
Culture: Prefers moist acidic conditions, tolerates most soils, urban pollution, and
partial shade
Hardiness Zone: 4 - 8
Growth Rate: Fast, 15 ft. tall at 4 years
Pest Problems: Excellent except some leaf scorch in warm climates
Storm Resistance: Good ascending branch angles improve resistance to storm damage
Salt Resistance: Susceptible to wind driven road and sea salt
Planting: Transplants easily, B&B or bare root, not suitable for CU-Structural Soil
planting
Pruning: Seldom needs pruning because of strong wood
Propagating: Own root cuttings are best due to graft incompatibility
Design Uses: Excellent specimen for streets where space is limited
Companions: Use with shrubs such as Taxus, evergreen Euonymus and perennials
Other Comments: One of the best Freeman maples
Available from: Most nurseries
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Armstrong Red Maple is a tall, narrow, fast growing tree well suited for urban sites. It has good disease resistance, and light green leaves.
Trade Name: Armstrong Red Maple
Botanical Name: Acer rubrum 'Armstrong'
Parentage: A. x freemanii that is often sold as A. rubrum
Family: Aceraceae
Height: 45' - 50'
Spread: 15' – 20'
Form: Narrow, fastigiate
Bloom Period: Very early in the spring
Flower: Red, profuse, produces both male and female flowers
Fruit: Winged, bright red samaras
Summer Foliage: Light green and glossy, similar in size to a red maple but shaped like a
silver maple leaf
Autumn Foliage: Yellow to orange-red occasionally, usually dull
Winter Color: Silvery color for winter interest
Bark: Silvery gray, easily damaged thin bark
Habitat: Native to entire east coast, west to the Mississippi River
Culture: Prefers moist acidic conditions, tolerates most soils, urban pollution, and
partial shade
Hardiness Zone: 4 - 8
Growth Rate: Fast, 15 ft. tall at 4 years
Pest Problems: Excellent except some leaf scorch in warm climates
Storm Resistance: Good ascending branch angles improve resistance to storm damage
Salt Resistance: Susceptible to wind driven road and sea salt
Planting: Transplants easily, B&B or bare root, not suitable for CU-Structural Soil
planting
Pruning: Seldom needs pruning because of strong wood
Propagating: Own root cuttings are best due to graft incompatibility
Design Uses: Excellent specimen for streets where space is limited
Companions: Use with shrubs such as Taxus, evergreen Euonymus and perennials
Other Comments: One of the best Freeman maples
Available from: Most nurseries
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Green Mountain Silver Linden
Green Mountain Silver Linden is a tall, pyramidal tree well suited for urban sites. It has good disease resistance, and dark green leaves that are silvery white underneath.
Trade Name: ‘Green Mountain’ Silver Linden
Botanical Name: Tilia tomentosa ‘PNI 6051'
Parentage: Developed by Princeton Nurseries
Family: Tiliaceae
Year of Introduction: 1970
Height: 45'
Spread: 35' – 40'
Form: Broad pyramidal shape
Bloom Period: Late June to early July
Flower: Yellowish white, fragrant, pendulous
Fruit: 1/3" nutlet, persistent and dry on the tree
Summer Foliage: Very dark green above, silvery white and pubescent below, shimmer in
the wind, 2" - 4" long
Autumn Foliage: Bright yellow in the autumn
Winter Color: Bark provides winter interest
Bark: Straight leader, gray, handsome
Habitat: Southeast Europe and western Asia
Culture: Rich medium loam, well-drained, any pH, full sun to partial shade,
tolerates heat, drought, and air pollution
Hardiness Zone: 5 – 8
Growth Rate: Faster than other lindens, 45' after 30 years, up to 2’ a year
Pest Resistance: Resistant to most Linden problems including aphids and Japanese
beetle feeding
Storm Resistance: Excellent
Salt Resistance: Excellent
Planting: B&B transplants easily, quick recovery, moderately difficult to transplant
bare root, suitable for CU-Structural Soil planting
Pruning: Prune broken branches at planting and 3 years later to mature form,
withstands severe pruning, may only require pruning of basal sprouts and
removal of some potential crotch problems
Propagating: Budded onto T. tomentosa understock
Design Uses: Well suited for street tree planting
Companions: Use with ground covers such as Vinca and Pachysandra, its dense
shade limits the quality of grass for a ground cover.
Other Comments: Handsome form, may only require pruning of basal sprouts, desirable for
the urban environment, dense branching, excellent tree in New England.
Available From: Most large nurseries
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Green Mountain Silver Linden is a tall, pyramidal tree well suited for urban sites. It has good disease resistance, and dark green leaves that are silvery white underneath.
Trade Name: ‘Green Mountain’ Silver Linden
Botanical Name: Tilia tomentosa ‘PNI 6051'
Parentage: Developed by Princeton Nurseries
Family: Tiliaceae
Year of Introduction: 1970
Height: 45'
Spread: 35' – 40'
Form: Broad pyramidal shape
Bloom Period: Late June to early July
Flower: Yellowish white, fragrant, pendulous
Fruit: 1/3" nutlet, persistent and dry on the tree
Summer Foliage: Very dark green above, silvery white and pubescent below, shimmer in
the wind, 2" - 4" long
Autumn Foliage: Bright yellow in the autumn
Winter Color: Bark provides winter interest
Bark: Straight leader, gray, handsome
Habitat: Southeast Europe and western Asia
Culture: Rich medium loam, well-drained, any pH, full sun to partial shade,
tolerates heat, drought, and air pollution
Hardiness Zone: 5 – 8
Growth Rate: Faster than other lindens, 45' after 30 years, up to 2’ a year
Pest Resistance: Resistant to most Linden problems including aphids and Japanese
beetle feeding
Storm Resistance: Excellent
Salt Resistance: Excellent
Planting: B&B transplants easily, quick recovery, moderately difficult to transplant
bare root, suitable for CU-Structural Soil planting
Pruning: Prune broken branches at planting and 3 years later to mature form,
withstands severe pruning, may only require pruning of basal sprouts and
removal of some potential crotch problems
Propagating: Budded onto T. tomentosa understock
Design Uses: Well suited for street tree planting
Companions: Use with ground covers such as Vinca and Pachysandra, its dense
shade limits the quality of grass for a ground cover.
Other Comments: Handsome form, may only require pruning of basal sprouts, desirable for
the urban environment, dense branching, excellent tree in New England.
Available From: Most large nurseries
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Snowdrift Crabapple
Snowdrift Crabapple is a tree with a round form that is well suited for urban sites and growing under the utility wires. It has good disease resistance, and dark green leaves that turn yellow in autumn. Its' persistent red fruits provide food for wildlife all winter long.
Trade Name: Snowdrift Crabapple
Botanical Name: Malus `Snowdrift'
Family: Rosaceae
Parentage: Cultivar of native species
Year of Introduction: 1975 introduction from Cole Nursery
Height: 15' – 20'
Spread: 15' – 20'
Form: Rounded, dense
Flower: Single, pink buds, white when open, abundant, over 1” diameter
Fruit: Orange red, 3/8", persistent
Foliage: Dark green, lustrous, heavy texture
Spring Color: Covered with white flowers in early spring
Summer Foliage: Rich light green darkens with age
Autumn Color: Yellow and orange leaves contrast nicely with red fruits
Winter Color: Persistent red fruits on dark twigs
Bark: Dark brown or gray
Habitat: Does very well throughout the U.S.
Culture: Well drained soil, acidic, partial shade is preferred
Hardiness Zone: 4 – 6
Growth Rate: Medium, full size in 25 years
Pest Resistance: Excellent resistance to cedar-apple rust and mildew, good resistance to
scab but not to fire blight
Storm Resistance: Good
Salt Resistance: Good
Planting: Fibrous roots allow any transplanting technique, including bare root, in
spring only, suitable for CU-Structural Soil planting
Pruning: Prune broken and dead branches at planting and 3 years later to mature
form
Propagating: Budding, grafting, softwood cuttings in summer
Design Uses: Excellent for residential, park, open spaces, and under utility wires
Companions: Does well with most perennials and other crabapples
Site Requirements: Likes most sites, most soils, and full sun
Other Comments: Rounded shape, dense leaves, vigorous grower
Available from: Most nurseries, one of the most popular crabapples
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Snowdrift Crabapple is a tree with a round form that is well suited for urban sites and growing under the utility wires. It has good disease resistance, and dark green leaves that turn yellow in autumn. Its' persistent red fruits provide food for wildlife all winter long.
Trade Name: Snowdrift Crabapple
Botanical Name: Malus `Snowdrift'
Family: Rosaceae
Parentage: Cultivar of native species
Year of Introduction: 1975 introduction from Cole Nursery
Height: 15' – 20'
Spread: 15' – 20'
Form: Rounded, dense
Flower: Single, pink buds, white when open, abundant, over 1” diameter
Fruit: Orange red, 3/8", persistent
Foliage: Dark green, lustrous, heavy texture
Spring Color: Covered with white flowers in early spring
Summer Foliage: Rich light green darkens with age
Autumn Color: Yellow and orange leaves contrast nicely with red fruits
Winter Color: Persistent red fruits on dark twigs
Bark: Dark brown or gray
Habitat: Does very well throughout the U.S.
Culture: Well drained soil, acidic, partial shade is preferred
Hardiness Zone: 4 – 6
Growth Rate: Medium, full size in 25 years
Pest Resistance: Excellent resistance to cedar-apple rust and mildew, good resistance to
scab but not to fire blight
Storm Resistance: Good
Salt Resistance: Good
Planting: Fibrous roots allow any transplanting technique, including bare root, in
spring only, suitable for CU-Structural Soil planting
Pruning: Prune broken and dead branches at planting and 3 years later to mature
form
Propagating: Budding, grafting, softwood cuttings in summer
Design Uses: Excellent for residential, park, open spaces, and under utility wires
Companions: Does well with most perennials and other crabapples
Site Requirements: Likes most sites, most soils, and full sun
Other Comments: Rounded shape, dense leaves, vigorous grower
Available from: Most nurseries, one of the most popular crabapples
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Hardy Rubber Tree
The Hardy Rubber Tree is a tree that develops a round form and is well suited for urban sites. It has excellent pest resistance and dark green leaves.
Trade Name: Hardy Rubber Tree
Botanical Name: Eucommia ulmoides
Family: Eucommiaceae
Parentage: Species from central China
Year of Introduction: 1896
Height: 40' – 60'
Spread: 40' – 60'
Form: Pyramidal in youth, rounded, broad spreading with age
Flower: Inconspicuous
Fruit: One inch long capsule
Foliage: 3” – 6” long elliptical leaves, similar to elms
Spring Color: Mid green
Summer Foliage: Dark green
Autumn Foliage: Green to yellowish green, poor color display
Winter Color: Interest in bark
Bark: Covered with ridges and furrows, grayish brown, attractive
Habitat: Does well in most locations, especially in the Midwest
Culture: Well drained soil, intolerant of poorly drained soil, tolerates most soil types
and pH
Site Requirements: Full sun
Hardiness Zone: 4 – 8, will not tolerate anything colder than -20°F
Growth Rate: Medium, 30 feet in 20 years
Pest Resistance: Nothing serious
Storm Resistance: Moderate
Salt Resistance: Moderate
Planting: Transplants B&B and BR readily, very well suited for CU-Structural Soil planting
Pruning: Seldom needed
Propagating: Seed
Design Uses: Useful as a shade tree
Other Comments: Excellent pest free tree that should be used more often, not popular
Available from: Select nurseries, may require some searching
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
The Hardy Rubber Tree is a tree that develops a round form and is well suited for urban sites. It has excellent pest resistance and dark green leaves.
Trade Name: Hardy Rubber Tree
Botanical Name: Eucommia ulmoides
Family: Eucommiaceae
Parentage: Species from central China
Year of Introduction: 1896
Height: 40' – 60'
Spread: 40' – 60'
Form: Pyramidal in youth, rounded, broad spreading with age
Flower: Inconspicuous
Fruit: One inch long capsule
Foliage: 3” – 6” long elliptical leaves, similar to elms
Spring Color: Mid green
Summer Foliage: Dark green
Autumn Foliage: Green to yellowish green, poor color display
Winter Color: Interest in bark
Bark: Covered with ridges and furrows, grayish brown, attractive
Habitat: Does well in most locations, especially in the Midwest
Culture: Well drained soil, intolerant of poorly drained soil, tolerates most soil types
and pH
Site Requirements: Full sun
Hardiness Zone: 4 – 8, will not tolerate anything colder than -20°F
Growth Rate: Medium, 30 feet in 20 years
Pest Resistance: Nothing serious
Storm Resistance: Moderate
Salt Resistance: Moderate
Planting: Transplants B&B and BR readily, very well suited for CU-Structural Soil planting
Pruning: Seldom needed
Propagating: Seed
Design Uses: Useful as a shade tree
Other Comments: Excellent pest free tree that should be used more often, not popular
Available from: Select nurseries, may require some searching
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Green Mountain Maple
The Green Mountain® Sugar Maple is a tree that develops a broad oval form and is well suited for urban sites. It has excellent pest resistance and dark green leaves.
Trade Name: ‘Green Mountain®’ Maple
Botanical Name: Acer saccharum ‘Green Mountain®’
Parentage: Selection from Acer saccharum x Acer nigrum at Princeton Nurseries
Plant Patent: # 2339
Introduction: Mid-1970's
Height: 50’ – 75’ (15-22 m)
Spread: 35’ – 40’ (11-12 m)
Form: Broad oval shape, symmetrical, branches droop as tree grows
Bloom Period: Before leaves in April
Flower: Typical of species
Fruit: Samara
Summer Foliage: Dark green, thick leaves covered with waxy coating that allow air
pollutants to wash off in rain rather than poisoning the tree
Autumn Foliage: Reddish orange and scarlet in autumn, reliable fall color
Winter Color: Unusual bark provides winter interest
Bark: Gray brown, thick plates with age
Habitat of Species: Eastern half of the US and Canada
Culture: Rich, well-drained soil, tolerates urban pollution, prefers acid soil,
tolerates light shade, excellent scorch resistance except in deep South – unless irrigated
Hardiness Zone: 3 – 7, considered the hardiest sugar maple
Growth Rate: Slow, full size in 45 – 60 years, growth averages 1’per year
Pest Problems: Better than species, resistant to Japanese Beetle damage
Storm Resistance: Excellent
Salt Resistance: Fair
Planting: Transplants easily bare root or B&B in spring, somewhat shallow rooted,
moderately suited for CU-Structural Soil planting
Pruning: Prune at planting and 3 years later to mature form, withstands severe
pruning
Propagating: Softwood cuttings in June with permission of Princeton Nurseries
Design Uses: Excellent specimen, good street tree, best with lots of room to grow
Companions: Use with ground covers such as Sedum, Ajuga, Galium, and
Chrysoganum
Other Comments: Retains color in dry, windy summer weather; tough tree; Green
Mountain® is the standard for comparison in sugar maples. It is the
most widely planted selection of sugar maples and has proven itself well
over time. It is the best choice for northern areas.
Available from: Most large nurseries
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
The Green Mountain® Sugar Maple is a tree that develops a broad oval form and is well suited for urban sites. It has excellent pest resistance and dark green leaves.
Trade Name: ‘Green Mountain®’ Maple
Botanical Name: Acer saccharum ‘Green Mountain®’
Parentage: Selection from Acer saccharum x Acer nigrum at Princeton Nurseries
Plant Patent: # 2339
Introduction: Mid-1970's
Height: 50’ – 75’ (15-22 m)
Spread: 35’ – 40’ (11-12 m)
Form: Broad oval shape, symmetrical, branches droop as tree grows
Bloom Period: Before leaves in April
Flower: Typical of species
Fruit: Samara
Summer Foliage: Dark green, thick leaves covered with waxy coating that allow air
pollutants to wash off in rain rather than poisoning the tree
Autumn Foliage: Reddish orange and scarlet in autumn, reliable fall color
Winter Color: Unusual bark provides winter interest
Bark: Gray brown, thick plates with age
Habitat of Species: Eastern half of the US and Canada
Culture: Rich, well-drained soil, tolerates urban pollution, prefers acid soil,
tolerates light shade, excellent scorch resistance except in deep South – unless irrigated
Hardiness Zone: 3 – 7, considered the hardiest sugar maple
Growth Rate: Slow, full size in 45 – 60 years, growth averages 1’per year
Pest Problems: Better than species, resistant to Japanese Beetle damage
Storm Resistance: Excellent
Salt Resistance: Fair
Planting: Transplants easily bare root or B&B in spring, somewhat shallow rooted,
moderately suited for CU-Structural Soil planting
Pruning: Prune at planting and 3 years later to mature form, withstands severe
pruning
Propagating: Softwood cuttings in June with permission of Princeton Nurseries
Design Uses: Excellent specimen, good street tree, best with lots of room to grow
Companions: Use with ground covers such as Sedum, Ajuga, Galium, and
Chrysoganum
Other Comments: Retains color in dry, windy summer weather; tough tree; Green
Mountain® is the standard for comparison in sugar maples. It is the
most widely planted selection of sugar maples and has proven itself well
over time. It is the best choice for northern areas.
Available from: Most large nurseries
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Southern Live Oak
The Live Oak – Quercus virginiana is extremely tolerant of hurricane force winds and makes an excellent specimen. It is also very suitable for street tree
Common Name: Live Oak, Southern Live Oak
Botanical Name: Quercus virginiana
Family: Fagaceae
Hardiness Zone: 8 – 10, does best in warmer locations within these Zones
Height: 40’ – 80’
Spread: 60’ – 100’
Growth Rate: Fast to moderate, 2 to 3 feet a year in youth, slows down with age
Form: Massive and wide spreading tree, horizontal branching
Bloom Period: Early spring, late March to early April
Flower: Brown catkins in clumps
Acorn: ½ – 1 inch long, 1 to 5 per stem, 1/3 covered by cap, dark brown to black
Spring Color: Old leaves drop off in spring, new leaves bright olive green
Summer Foliage: Dark green, glossy, willow leaf shaped
Autumn Foliage: No fall color
Winter Interest: Evergreen leaves provide winter color
Bark: Very dark, almost black, blocky appearance on mature trees
Roots: Can form large surface roots
Habitat: Native to the southeastern part of the US
Culture: Prefers moist bottomland, well-drained soil, tolerates alkaline and
compacted soils
Pest Resistance: No serious disease or insect problems, very long-lived tree exceeding
300 years
Storm Resistance: Excellent
Salt Resistance: Excellent
Planting: Transplant B&B or containerized in small sizes, well suited for CU-
Structural Soil planting
Propagating: Seed
Pruning: For good structure prune annually in first 5 years, then every 5 years to
age 30
Design Uses: Excellent specimen for parks, streets without sidewalks, mansions, and
other large landscapes
Companions: Best with other Live Oaks, junipers, and lawns
Other Comments: Excellent specimen, suitable for street tree, usually graced with Spanish
moss and strongly reminiscent of the Old South, extremely tolerant of
hurricane force winds, useful in reforestation projects. Live oak was
widely used in early American shipbuilding.
Awards: 2013 Urban Tree of the Year by the Society of Municipal Arborists, it is
also the official state tree of Georgia. The national champion live oak is
near Louisburg, Louisiana. The latest measurements indicate it has a
trunk diameter of 12.39', a height of 68', and a crown spread of 139'.
Available from: Most large nurseries in Southeastern US.
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
The Live Oak – Quercus virginiana is extremely tolerant of hurricane force winds and makes an excellent specimen. It is also very suitable for street tree
Common Name: Live Oak, Southern Live Oak
Botanical Name: Quercus virginiana
Family: Fagaceae
Hardiness Zone: 8 – 10, does best in warmer locations within these Zones
Height: 40’ – 80’
Spread: 60’ – 100’
Growth Rate: Fast to moderate, 2 to 3 feet a year in youth, slows down with age
Form: Massive and wide spreading tree, horizontal branching
Bloom Period: Early spring, late March to early April
Flower: Brown catkins in clumps
Acorn: ½ – 1 inch long, 1 to 5 per stem, 1/3 covered by cap, dark brown to black
Spring Color: Old leaves drop off in spring, new leaves bright olive green
Summer Foliage: Dark green, glossy, willow leaf shaped
Autumn Foliage: No fall color
Winter Interest: Evergreen leaves provide winter color
Bark: Very dark, almost black, blocky appearance on mature trees
Roots: Can form large surface roots
Habitat: Native to the southeastern part of the US
Culture: Prefers moist bottomland, well-drained soil, tolerates alkaline and
compacted soils
Pest Resistance: No serious disease or insect problems, very long-lived tree exceeding
300 years
Storm Resistance: Excellent
Salt Resistance: Excellent
Planting: Transplant B&B or containerized in small sizes, well suited for CU-
Structural Soil planting
Propagating: Seed
Pruning: For good structure prune annually in first 5 years, then every 5 years to
age 30
Design Uses: Excellent specimen for parks, streets without sidewalks, mansions, and
other large landscapes
Companions: Best with other Live Oaks, junipers, and lawns
Other Comments: Excellent specimen, suitable for street tree, usually graced with Spanish
moss and strongly reminiscent of the Old South, extremely tolerant of
hurricane force winds, useful in reforestation projects. Live oak was
widely used in early American shipbuilding.
Awards: 2013 Urban Tree of the Year by the Society of Municipal Arborists, it is
also the official state tree of Georgia. The national champion live oak is
near Louisburg, Louisiana. The latest measurements indicate it has a
trunk diameter of 12.39', a height of 68', and a crown spread of 139'.
Available from: Most large nurseries in Southeastern US.
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Emerald City Tulip Tree
The Emerald City® Tulip Tree is a refined cultivar of our familiar native tulip tree. This tree has a uniform growing habit that is straighter and a more upright form, with deeper green, slightly glossy leaves.
Trade Name: Emerald City® Tulip Tree
Botanical Name: Liriodendron tulipifera ‘JFS-Oz’
Parentage: Selection from Liriodendron tulipifera and introduced by J. Frank Schmidt
& Son
Family: Magnoliaceae
Year of Introduction: 2010
Height: 55’ (17 m)
Spread: 25’ (7.5 m)
Form: Oval shape, upright branching, with a dominant central leader
Bloom Period: June, tree has to be growing for 8 – 12 years before it blooms
Flower: Tulip like yellow to yellowish green flowers with an orange center
Fruit: Pyramidal, dry pods 2" – 3" long, persistent thorough winter
Summer Foliage: Dense, square shaped, glossy, deep green in summer
Autumn Foliage: Yellow to clear yellow in autumn
Winter Color: Bark provides winter interest
Bark: Grayish brown with ridges, typical of species
Habitat of Species: Eastern half of the US and Canada
Culture: Rich, well-drained soil, prefers slightly acid soil, sun or partial shade, will
not tolerate clay soils, drought or sunscald
Hardiness Zone: 5 – 9
Growth Rate: Rapid, mature size at 40 years
Pest Problems: Several minor problems
Storm Resistance: May break up in ice and severe storms
Salt Resistance: Fair to poor
Planting: Transplants easily bare root or B&B in spring, roots fleshy and poorly
branched, moderately suited for CU-Structural Soil planting
Pruning: Prune in winter
Propagating: Softwood cuttings in June from stems or roots, grafted
Design Uses: Excellent specimen, best with lots of room to grow
Companions: Use with ground covers such as Sedum, Ajuga, Galium, and Chrysoganum
Other Comments: Refined cultivar of a familiar native, lives for up to 200 years
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
The Emerald City® Tulip Tree is a refined cultivar of our familiar native tulip tree. This tree has a uniform growing habit that is straighter and a more upright form, with deeper green, slightly glossy leaves.
Trade Name: Emerald City® Tulip Tree
Botanical Name: Liriodendron tulipifera ‘JFS-Oz’
Parentage: Selection from Liriodendron tulipifera and introduced by J. Frank Schmidt
& Son
Family: Magnoliaceae
Year of Introduction: 2010
Height: 55’ (17 m)
Spread: 25’ (7.5 m)
Form: Oval shape, upright branching, with a dominant central leader
Bloom Period: June, tree has to be growing for 8 – 12 years before it blooms
Flower: Tulip like yellow to yellowish green flowers with an orange center
Fruit: Pyramidal, dry pods 2" – 3" long, persistent thorough winter
Summer Foliage: Dense, square shaped, glossy, deep green in summer
Autumn Foliage: Yellow to clear yellow in autumn
Winter Color: Bark provides winter interest
Bark: Grayish brown with ridges, typical of species
Habitat of Species: Eastern half of the US and Canada
Culture: Rich, well-drained soil, prefers slightly acid soil, sun or partial shade, will
not tolerate clay soils, drought or sunscald
Hardiness Zone: 5 – 9
Growth Rate: Rapid, mature size at 40 years
Pest Problems: Several minor problems
Storm Resistance: May break up in ice and severe storms
Salt Resistance: Fair to poor
Planting: Transplants easily bare root or B&B in spring, roots fleshy and poorly
branched, moderately suited for CU-Structural Soil planting
Pruning: Prune in winter
Propagating: Softwood cuttings in June from stems or roots, grafted
Design Uses: Excellent specimen, best with lots of room to grow
Companions: Use with ground covers such as Sedum, Ajuga, Galium, and Chrysoganum
Other Comments: Refined cultivar of a familiar native, lives for up to 200 years
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
Ivory Silk Tree Lilac
The Ivory Silk Tree Lilac is a refined cultivar of the Japanese tree lilac. This tree has a uniform growing habit that is oval, with blue green leaves.
Trade Name: ‘Ivory Silk’ Tree Lilac
Botanical Name: Syringa reticulata ‘Ivory Silk’
Parentage: This selection was found by Sheridan Nursery in 1975
Habitat: Species introduced from Japan in 1876
Plant Patent: PP#7205
Height: 20' - 25'
Spread: 15' – 20'
Form: Sturdy, compact, oval growth habit
Bloom Period: Mid June to July bloom,
Flower: Large creamy white clusters 6" - 12" long, begin flowering at an early
age, penetrating fragrance like privet, not like common lilac
Fruit: Clusters of capsules turn from green to brown, persistent through winter;
capsule is three quarters of an inch long
Summer Foliage: Larger than common lilac, blue green color in summer, 3" - 6" long
Autumn Foliage: Autumn color is sometimes green with reddish band on leaf margin,
generally no color, spent flowers are considered unsightly by some
Winter Color: Cherry-like bark plus persistent brown capsules provide winter interest
Bark: Cherry-like, reddish brown that turns heavily lenticelled, gray and scaly
with age, glossy, straight trunk
Culture: Full sun is best, flower quantity is greatly diminished in partial shade, pH 6.5 - 8, well-drained soil, prefers cool summers
Hardiness Zone: 3 – 8
Growth Rate: Medium, 25' high and 15' wide after 30 years
Pest Problems: Resistant to borer, scale, and mildew, most trouble free lilac
Salt Tolerance: Good tolerance
Planting: Transplants easily by bare root and B&B, well-suited for CU-Structural
Soil planting
Pruning: Prune at planting and 3 years later to mature form
Propagation: Not true from seed, must be budded onto Syringa reticulata seedlings or
by softwood cuttings
Design Uses: Good street tree for under wires, excellent specimen for residential
landscapes as a single tree or in groups
Companions: Use with Phlox subulata ground cover
Other Comments: Medium texture in all seasons, uniform shape, selected by the Society of Municipal Arborists as the 1997 Urban Tree of the Year
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.
The Ivory Silk Tree Lilac is a refined cultivar of the Japanese tree lilac. This tree has a uniform growing habit that is oval, with blue green leaves.
Trade Name: ‘Ivory Silk’ Tree Lilac
Botanical Name: Syringa reticulata ‘Ivory Silk’
Parentage: This selection was found by Sheridan Nursery in 1975
Habitat: Species introduced from Japan in 1876
Plant Patent: PP#7205
Height: 20' - 25'
Spread: 15' – 20'
Form: Sturdy, compact, oval growth habit
Bloom Period: Mid June to July bloom,
Flower: Large creamy white clusters 6" - 12" long, begin flowering at an early
age, penetrating fragrance like privet, not like common lilac
Fruit: Clusters of capsules turn from green to brown, persistent through winter;
capsule is three quarters of an inch long
Summer Foliage: Larger than common lilac, blue green color in summer, 3" - 6" long
Autumn Foliage: Autumn color is sometimes green with reddish band on leaf margin,
generally no color, spent flowers are considered unsightly by some
Winter Color: Cherry-like bark plus persistent brown capsules provide winter interest
Bark: Cherry-like, reddish brown that turns heavily lenticelled, gray and scaly
with age, glossy, straight trunk
Culture: Full sun is best, flower quantity is greatly diminished in partial shade, pH 6.5 - 8, well-drained soil, prefers cool summers
Hardiness Zone: 3 – 8
Growth Rate: Medium, 25' high and 15' wide after 30 years
Pest Problems: Resistant to borer, scale, and mildew, most trouble free lilac
Salt Tolerance: Good tolerance
Planting: Transplants easily by bare root and B&B, well-suited for CU-Structural
Soil planting
Pruning: Prune at planting and 3 years later to mature form
Propagation: Not true from seed, must be budded onto Syringa reticulata seedlings or
by softwood cuttings
Design Uses: Good street tree for under wires, excellent specimen for residential
landscapes as a single tree or in groups
Companions: Use with Phlox subulata ground cover
Other Comments: Medium texture in all seasons, uniform shape, selected by the Society of Municipal Arborists as the 1997 Urban Tree of the Year
Fact Sheet
The test that follows contains 10 questions. Before taking the test be sure you have read the article carefully. The passing grade is 80% on the entire test.
ISA will award .5 CEUs* for a passing grade. SAF members will earn 0.5 Cat. 1-CF for every five passing test scores. The cost for taking this test is $10. If you purchase an annual subscription for 15 credits, the cost per credit is reduced by 50% (see Annual Subscription link below). We will report all passing test scores to ISA and/or SAF. If you are a member of ISA and SAF we will report your passing test scores to both for no additional cost. Please be sure to add both of your certification numbers when you sign in. Tests with passing scores may be submitted only once to each organization.
*Members of ISA may apply the .5 CEUs toward Certified Arborist, Utility Specialist, Municipal Specialist, Tree Worker Specialist, Aerial Lift Specialist, or BCMA science credits.
California UFC members will receive credit for passing the test. Please add your CaUFC number after your ISA and/or SAF certification number.
ASCA members may submit your ISA certification record to the ASCA and receive credits one for one.
MTOA members must follow the ISA instructions indicated above.
To take the test by the pay per test option, click on the 'Pay Now' button below where you can send payment online securely with your credit card or Pay Pal account. After your payment is submitted, click on ‘Return to gibneyCE.com’. That will take you to the test sign in page followed by the test. Members with certifications from both ISA and SAF, please be sure to add both of your certification numbers. These numbers are important for reporting purposes.
To take the test as an annual subscriber with reduced rates, click on Password and enter your test password which will take you to the test sign in page. If you would like to become a subscriber see our Annual Subscription page for details.
When you have finished answering all questions you will be prompted to click ‘next’ to send your answers to gibneyCE.com. You can then click ‘next’ to view your test summary. A test review of your answers is available upon request.
All passing test scores are sent from gibneyCE.com to your organization(s) at the end of every month and they will appear on your certification record 4 to 6 weeks* after that. ISA maintains a record of CEU credits on their website *SAF requires 5 passing test scores before reporting.
Test re-takes are allowed, however you will have to pay for the retake if you are using the pay per test option. You can spend as much time as you would like to take the test but it is important not to leave the test site until you have answered all the questions and see the 'sending your answers' response.