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Home My WebLink AboutEx_10_TR_Arborist_Report_210804_v1 LAYTON TREE CONSULTING, LLC It’s all about trees…… PO BOX 572, SNOHOMISH, WA 98291-0572 * 425-220-5711 * bob@laytontreeconsulting.com ARBORIST REPORT/TREE PLAN 960 Harrington Avenue NE Renton, WA Report Prepared by: Bob Layton Registered Consulting Arborist #670 Certified Arborist #PN-2714A April 19, 2021 Updated June 30, 2021 EXHIBIT 10 RECEIVED 08/30/2021 jding PLANNING DIVISION DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB Arborist Report – 960 Harrington AVE NE Page 2 Layton Tree Consulting LLC April 19, 2021 Updated June 30, 2021 Table of Contents Assignment.................................................................................................................................................... 3 Description .................................................................................................................................................... 3 Methodology ................................................................................................................................................. 3 Judging Condition...................................................................................................................................... 3 Observations ................................................................................................................................................. 4 Discussion/Recommendations ...................................................................................................................... 4 Tree Density-Tree Replacement ................................................................................................................... 6 Arborist Disclosure Statement ...................................................................................................................... 6 Attachments Photos, pages 7 - 13 Tree Summary Table Tree Plan Map Preliminary Site Plan – Snap Shot City of Renton – Approved Tree List Updates in red text DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB Arborist Report – 960 Harrington AVE NE Page 3 Layton Tree Consulting LLC April 19, 2021 Updated June 30, 2021 Assignment Layton Tree Consulting, LLC was asked to compile an Arborist Report for one parcel in Renton. The subject property is located at 960 Harrington AVE NE. The purpose of the report is to satisfy City requirements regarding tree retention regulations associated with the proposed redevelopment of the property. My assignment is to prepare a written report on present tree conditions, and to provide appropriate recommendations for the protection of retained or protected trees during development. This report covers all of the criteria set forth under the City of Renton’s tree regulations, Municipal Code Section 4-4-130 - Tree Retention and Land Clearing Regulations. Date of Field Examination: April 13, 2021 Description Three significant trees were identified on the property. A significant tree is any tree with a caliper of at least 6-inches or alder or cottonwood tree at least 8-inches. A numbered aluminum tag was attached to the lower trunk of the subject trees. These tag numbers correspond with the numbers on the attached Tree Summary Table and attached Tree Plan Map. An additional three off-site trees were also assessed. These exist within the right-of-way of NE Sunset Blvd. These are all mature London plane trees. Methodology Each tree in this report was visited. Tree diameters were measured by tape. The tree heights were measured using a Spiegel Relaskop. Each tree was visually examined for defects and vigor. The tree assessment procedure involves the examination of many factors: • The crown or canopy of the tree is examined for current vigor/health by examining the foliage for appropriate color and density, the vegetative buds for color and size, and the branches for structural form and annual shoot growth; and the overall presence of limb dieback and/or any disease issues. • The trunk or main stem of the tree is inspected for decay, which includes cavities, wounds, fruiting bodies of decay (conks or mushrooms), seams, insect pests, bleeding or exudation of sap, callus development, broken or dead tops, structural defects and unnatural leans. Structural defects can include but are not limited to excessive or unnatural leans, crooks, forks with V-shaped crotches, multiple attachments. • The root collar and exposed surface roots are inspected for the presence of decay, insect damage, as well as if they have been injured or wounded, undermined or exposed, or the original grade has been altered. Judging Condition The three condition categories are described as follows: DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB Arborist Report – 960 Harrington AVE NE Page 4 Layton Tree Consulting LLC April 19, 2021 Updated June 30, 2021 Good – free of significant structural defects, no disease concerns, minor pest issues, no significant root issues, good structure/form with uniform crown or canopy, foliage of normal color and density, average or normal vigor, will be wind firm if isolated or left as part of a grouping or grove of trees, suitable for its location Fair – minor to moderate structural defects not expected to contribute to a failure in near future, no disease concerns, moderate pest issues, no significant root issues, asymmetric or unbalanced crown or canopy, average or normal vigor, foliage of normal color, moderate foliage density, will be wind firm if left as part of a grouping or grove of trees, cannot be isolated, suitable for its location Poor – major structural defects expected to cause fail in near future, disease or significant pest concerns, decline due to old age, significant root issues, asymmetric or unbalanced crown or canopy, sparse or abnormally small foliage, poor vigor, not suitable for its location The attached Tree Summary Table provides specific information on tree sizes and dripline measurements. Observations The subject trees are described as follows: Tree #1 is a semi-mature to mature Austrian pine. It has developed an asymmetric crown and lean to the south away from Tree #2. The root crown and ground around the tree are covered with a dense matt of English ivy. Vigor is good. Foliage is of normal color and density. The lower trunk appears sound. Root growth has cracked surrounding pavement and lifted curb sections. Condition is ‘fair’. Tree #2 is a mature London plane. It is surrounded by pavement and a sidewalk. There is obvious root growth beneath the pavement that extends up to 20-feet from the trunk to the east. The tree has developed good structural form. Vigor appears good. No concerning conditions were observed. Condition is rated as ‘good’. Tree #3 is a young to semi-mature Austrian pine, comprised of two stems or trunks. It also has an asymmetric crown and lean to the south away from the larger plane trees. Condition is ‘fair’. Right-of-way Trees Trees #4, #5 and #6 are mature London plane trees within the right-of-way of Sunset Blvd. NE. Trees #4 and #5 have developed good structural form with no concerning issues. Lower trunks are sound with no outward indicators of any internal decay issues. Vigor appears good. Condition is rated as ‘good’. The lower trunk of Tree #6 forks into two main stems or trunks, which are codominant (equal diameter). There is a moderate buildup of included or embedded bark between the forked stems. Vigor appears good. Condition is rated as ‘fair’. Discussion/Recommendations It is my understanding the City would like to see Trees #4, #5 and #6 preserved. Tree #6 is well away from the subject property and not likely to be impacted. London plane is actually quite hardy and DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB Arborist Report – 960 Harrington AVE NE Page 5 Layton Tree Consulting LLC April 19, 2021 Updated June 30, 2021 tolerable of construction impacts, so long as those impacts are kept to acceptable levels. It is also my understanding that Trees #1, #2 and #3 are being proposed for removal. Based on the proposed preliminary design, Tree #2 cannot be feasibly retained. There is an existing side sewer running right underneath the tree that needs to be upgraded and/or replaced. There are also required street frontage improvements to construct a new curb, gutter, and sidewalk. Several large surface roots are currently lifting the sidewalk and nearby asphalt. Replacing these will cause consequential damage to large structural roots. Because of the grade transition to building finish floor, a stair case and retaining wall will need to be constructed within a close proximity of the trunk. In addition, a minimum 10 construction or work zone beyond the face of the new building wall for footing excavation, roof drains and foundation drains will be required. The cumulative impacts associated with the re-development will ultimately compromise the structural stability and health of this tree. Whether or not Trees #4 and #5 can be retained will depend on the required street frontage improvements. Relocating the sidewalk to the opposite sides of Trees #4 and #5 will create major disturbances and have consequential impacts on long-term health. The existing grades are not conducive to relocating the sidewalk as it slopes down from the elevation of the existing sidewalk. If the existing sidewalk can be left as-is, the odds of successful retention are much higher. It appears the preferable location for the new sidewalk will be on the new building side of Trees #4 and #5. It is possible but work will need to be performed diligently. It will require some fill soils to achieve the necessary grade. Minimal excavation of only the top +/- 2-inch organic/sod layer shall be allowed to prepare the sub-base for the new walkway. All surface roots shall be left intact within the critical root zone. Gravel shall be used to raise the grade to the necessary elevation. Compaction shall be limited within the critical root zone. All work within the defined critical root zone will be performed utilizing hand-labor only. Tree locations are shown on the attached Tree Plan Map. The driplines of trees have been delineated on the map, as well as the recommended location of the critical root zone boundary. The critical root zone boundary is based on species, age, condition, dripline, prior improvements, proposed impacts and the anticipated cumulative impacts to the entire root zone. Encroachment beyond this limit is likely to compromise long-term health or longevity. Pavement or sidewalk sections within the critical root zone boundary shall be removed using primarily hand-labor. Pavement/concrete can be broken up with a manual jack-hammer and removed by hand from the tree protection zone. Keep equipment off of the critical root zone boundary to protect soils and surface roots. A tree protection barrier shall be placed around any retained or protected trees to the largest extent possible and fully protect the critical root zone. Cover tree protection areas with a protective +/- 6-inch layer of coarse arborist wood chip mulch or hog fuel. Thoroughly irrigate any newly exposed areas from pavement/concrete removal prior to covering with wood chips. DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB Arborist Report – 960 Harrington AVE NE Page 6 Layton Tree Consulting LLC April 19, 2021 Updated June 30, 2021 Any roots encountered during work outside of the tree protection areas shall be pruned clean at sound tissue prior to backfilling or finishing areas. Sound tissue is where the root is undamaged and the bark is completely intact with the root. Any authorized work within dripline of retained and/or protected trees shall be supervised by the project arborist in an effort to ensure impacts are kept as minimal as possible or to acceptable levels. Some pruning of Trees #4 and #5 may be needed to provide adequate construction clearance. The amount of anticipated pruning or removal of branches is not significant and not expected to have any adverse impacts on tree health or stability. All clearance pruning will conform to ANSI A-300 Pruning Standards. Simply finish the landscape within the driplines of any retained/protected trees by cutting/hand-pulling any unwanted vegetation, raking off half of the protective wood chips and applying a more attractive 2 to 4-inch covering of organic mulch/beauty bark. Keep large plantings, irrigation/dispersion trenches and construction of hardscapes outside of the dripline where possible. Tree Density-Tree Replacement Consult with your City planner on tree replacement/landscape requirements. Replacement trees shall be at least 2-inch caliper for deciduous species and 6-feet in height for evergreen species. The City’s approved tree list is attached. Replacement tree species shall be chosen from this list. Plant new trees in areas where they can fully mature without conflicting with new improvements. Arborist Disclosure Statement Arborists are tree specialists who use their education, knowledge, training and experience to examine and assess trees, recommend measures to enhance the beauty and health of trees, and attempt to reduce the risks associated with living near trees. Clients may choose to accept or disregard the recommendations of the arborist, or to seek additional advice. Arborists cannot detect every condition that could possibly lead to the structural failure of a tree. Trees are living organisms that grow, respond to their environment, mature, decline and sometimes fail in ways we do not fully understand. Conditions are often hidden within trees and below ground. Arborists cannot guarantee that a tree will be healthy and/or safe under all circumstances, or for a specified period of time. Likewise, remedial treatments, like any medicine, cannot be guaranteed. Treatment, pruning and removal of trees may involve considerations beyond the scope of the arborist’s services such as property boundaries, property ownership, site lines, disputes between neighbors, and other issues. Arborists cannot take such considerations into account unless complete and accurate information is disclosed to the arborist. An arborist should then be expected to reasonably rely upon the completeness and accuracy of the information provided. Trees can be managed, but they cannot be controlled. To live near trees is to accept some degree of risk. The only way to eliminate all risk associated with trees is to eliminate all trees. DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB Arborist Report – 960 Harrington AVE NE Page 7 Layton Tree Consulting LLC April 19, 2021 Updated June 30, 2021 Photo Documentation Tree #1 – lower trunk Tree #1 – lower trunk, obvious root growth beneath pavement DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB Arborist Report – 960 Harrington AVE NE Page 8 Layton Tree Consulting LLC April 19, 2021 Updated June 30, 2021 Trees #1 and #2, looking north up Harrington Ave NE Tree #2 – lower trunk DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB Arborist Report – 960 Harrington AVE NE Page 9 Layton Tree Consulting LLC April 19, 2021 Updated June 30, 2021 Tree #2 – mid crown Tree #2 – lower trunk, sidewalk has lifted and been repaired in the past DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB Arborist Report – 960 Harrington AVE NE Page 10 Layton Tree Consulting LLC April 19, 2021 Updated June 30, 2021 Tree #3 on right, #4 on left, #5 in background Tree #4 – lower trunk, large surface roots extending several feet to the south DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB Arborist Report – 960 Harrington AVE NE Page 11 Layton Tree Consulting LLC April 19, 2021 Updated June 30, 2021 Trees #4 and #5 within proximity to sidewalk Tree #5 in foreground, #4 in background DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB Arborist Report – 960 Harrington AVE NE Page 12 Layton Tree Consulting LLC April 19, 2021 Updated June 30, 2021 Tree #5 in foreground, #4 in background Tree #6 – lower trunk DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB Arborist Report – 960 Harrington AVE NE Page 13 Layton Tree Consulting LLC April 19, 2021 Updated June 30, 2021 Tree #6 – lower trunk Tree #6 DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB Layton Tree Consulting LLC For:Zarnoor Associates Site:960 Harrington AVE NE - Renton Tree Summary Table Date: Tree/DBH Height Tag #Species (inches)(feet)Condition Comments Proposal N S E W 1 Austrian pine 23 45 6 15 12 8 Fair asymmetric crown/lean south, root crown covered with ivy Remove 2 London plane 42 83 30 32 36 24 Good trunk sound ,sound stem attachments Remove 3 Austrian pine 9,5 (10)24 6 14 10 4 Fair leans south, natural lean Remove OFF-SITE TREES 4 London plane 34 67 22 26 20 36 Good sound trunk, large exposed surface roots to south TBD 5 London plane 29 70 18 28 22 21 Good sound trunk, large exposed surface roots to south TBD 6 London plane 46 85 28 30 NA 30 Fair trunk forks at 5 feet, noteworthy included bark Protect Drip-Line measurements from face of trunk TBD - to be determined Drip-Line / Limits of Disturbance (feet) 4/13/2021 Calculated DBH: the DBH is parenthesis is the square root of the sum of the dbh for each individual stem squared (example with 3 stems: dbh = square root [(stem1)2 +(stem2)2 +(stem3)2 ]). DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB APPROVED TREE LIST – Small, Medium, and Large H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\treeslist_march2010.doc P. 1 In the City of Renton there is an overabundance of maple and cherry species. According to the most recent street tree inventory, maples currently comprise 35% and cherry 24% of all species. To reduce a catastrophic loss of species, experts agree that 10% o r less of any species or cultivar exist within a street tree population. Because of this, planting maple or cherry trees within the right -of-way is discouraged. SMALL TREES: 30 feet in height or less Botanical name / Common Name Mature Height in Feet Mature Spread in Feet Fall Color Comments Acer buergeranum / Trident Maple 20 20 yellow orange and red Adaptable to urban environments. Decidiuous: prefers moist, well-drained soils: tolerates infertile sites. Drought tolerant. Acer campestre / Hedge Maple 30 30 yellow Deciduous; prefers moist, rich soils; slow growing tree tolerant of air pollution and soil compaction; yellow fall color; cultivars available including Queen Elizabeth maple (‘Evelyn’) with dark green, glossy foliage. Acer circinatum / Vine Maple 20-25 10 orange and red Deciduous; prefers moist, well-drained soils; tolerates seasonal saturation and varying soil types; drought tolerant once established; bushy shrub or small tree; most often multi-trunked and does well in small groups; white flowers April- June. Acer ginnala 'Flame' / Amur Maple 20 20 red Deciduous; prefers moist, well-drained soils, but is tolerant of drought; is often multi-trunked, but can be pruned to a single stem; rounded form; fragrant, yellowish-white flowers in spring; cultivars are available such as ‘Flame’ and ‘Embers’ with differing fall colors. Select or prune for single stem; can be multi- trunked. Acer grandidentatum 'Schmidt' / Rocky Mt. Glow Maple 25+ 15 intense Acer griseum / Paperback Maple 25 20 scarlet Deciduous; prefers moist, well-drained soils, but is moderately drought tolerant; bronze peeling bark provides year-round visual interest; often multitrunked, but can be trained to a single stem; slow growing; disease and pest resistant. Smooth, peeling, cinnamon colored bark. DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB APPROVED TREE LIST – Small, Medium, and Large H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\treeslist_march2010.doc P. 2 Botanical name / Common Name Mature Height in Feet Mature Spread in Feet Fall Color Comments Acer palmatum / Japanese Maple 20 24 yellow, orange, red Prefers moist, well-drained soils; deciduous; slow to moderate growth rate; multi-trunked with spreading branches; intolerant of inundation but moderately drought resistant; vibrant fall colors; many cultivars available including ‘Emperor I’, ‘Katsura’, and ‘Osakazuki’. Hundreds of varied cultivars. Can be slow growing. Acer saccharum 'Apollo' 25 10 yellow, orange Prefers well drained soils, but grows in varying soils; hearty. Acer platanoides 'Globosum' / Globe Norway Maple 20 18 yellow Moist soils preferred, but tolerates drought and seasonal inundation; tolerant of urban pollution; dense, compact, round form; slow-growing deciduous tree with brilliant fall color; shallow root system may make mowing under the tree slightly difficult; good selection for locations under power lines; another cultivar well suited for such a location is A. platanoides ‘Almira,’ reaching only 20-25 ft. Rounded top, and compact growth. Acer truncatum / Purpleblow maple 20-25 20-25 Prefers moist, well-drained soil, but drought tolerant; very cold hardy deciduous tree; moderate growth rate; yellow flowers in spring; an additional maple cultivar of interest is 'Pacific sunset'. Acer truncatum x A. platanoides 'Warren's Red' / Pacific Sunset 30 25 yellow- orange/ red Acer Triflorum - Roughbark maple 25-30 20-25 apricot, gold Deciduous; prefers moist soils, but somewhat drought tolerant once established; rough, knobby trunk provides interest in winter; disease and pest resistant; non- aggressive roots do not damage sidewalks or driveways. Amelanchier grandiflora 'Princess Diana' 20 15 bright red Good for limited space. Amelanchier x grandiflora 'Autumn Brilliance' Serviceberry 20 15 red or yellow Moist to dry, well-drained soils; small tree; drought tolerant; white clustered flowers in spring; also try 'Princess Diana' for bright red fall color and the slightly taller 'Robin Hill' (20-30 feet). Reliable bloom. Amelanchier laevis ' lustre' / Luster Serviceberry 25 25 red or yellow Moist to dry, well-drained soils; small tree; drought tolerant; white clustered flowers in spring. DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB APPROVED TREE LIST – Small, Medium, and Large H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\treeslist_march2010.doc P. 3 Botanical name / Common Name Mature Height in Feet Mature Spread in Feet Fall Color Comments Arbutus 'Marina' 25 15 evergreen Good substitute for Pacific Madrone. May exceed 25' height under some site conditions. Carpinus caroliniana / American hornbeam 20-30 20-20 Deciduous; prefers moist, rich soils; grows near saturated areas but is only weakly tolerant of saturation; blooms March-May; slow growing; deep coarse laterally spreading roots; medium life span; also consider Carpinus japonica (Japanese hornbeam). Cercis canadensis / Eastern Redbud 25 30 yellow Deciduous; prefers moist, rich soils; tolerant of shade; somewhat drought resistant, but not in full sun; purple-lavender flowers; medium longevity; often multi-trunked; shallow, fibrous roots become deeper on drier sites; fairly short- lived; blooms March-May. Blooms before leaves are out. Cornus kousa 'Chinensis' / Chinese Kousa Dogwood 20 20 reddish to scarlet Prefers moist soils; tolerant of varying soil types; moderate growth rate; deciduous; white flowers in June and large red fruits that resemble a raspberry in September; red to maroon fall color; more disease resistant than other dogwoods; many additional cultivars available. Most resistant to disease of the dogwoods. Crataegus crus-galli 'Inermis' / Thornless Cockspur Hawthorn 25 30 orange to scarlet Red persistent fruit. Crataegus x lavalii / Lavalle Hawthorne 28 20 bronze, coppery red Deciduous; prefers moist, well-drained soil, but tolerant of varying soil types; white flowers in spring; fruit can be a bit messy. Thorns on younger trees. Crataegus phaenopyrum / Washington Hawthorn 25 20 scarlet Thorny. Fraxinus pennsylvanica 'Johnson' / Leprechaun Ash 18 16 yellow Prefers moist, well-drained soils; deciduous: slow to moderate growth rate; tolerant of inundation but moderately drought resistant. A miniature in every way. Magnolia x loebneri 20 20 yellow Several cultivars. Magnolia grandiflora 'Little Gem' 15 10 evergreen Useful where larger varieties are inappropriate. Magnolia grandiflora 'Victoria' 25 20 evergreen DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB APPROVED TREE LIST – Small, Medium, and Large H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\treeslist_march2010.doc P. 4 Botanical name / Common Name Mature Height in Feet Mature Spread in Feet Fall Color Comments Malus spp. / Flowering crabapple 15-25 6-15 Selection should be based on disease resistance to apple scab and fireblight. Tolerant of prolonged soil saturation; short lived; tolerant of drought and seasonally saturated soils; deciduous; white or faintly pink flowers in spring; numerous Malus species and cultivars provide a variety of foliage and flower colors, forms and fruit. Malus 'Adirondack' 18 8 yellow Red fruit. Excellent scab resistance. Malus 'Red Barron' 18 8 yellow Good for narrow spaces. Red berries. Malus 'Golden Raindrops' 18 13 yellow Abundant yellow fruit. Malus 'Tschonoskii' 28 14 scarlet Sparse green fruit, pyramidal. Parrotia persica / Persian Parrotia 30 20 yellow- orange red Moist to dry soils; drought tolerant when established, deciduous tree with moderate growth rate; brilliant fall color; often multi-trunked, but can be trained to have just one; tolerates urban pollution and soil compaction; surface roots do not generally cause problems; virtually disease and pest-free. Pranus 'Frankthrees' / Mt. St. Helens Plum 20 20 Purple foliage. Prunus 'Newport' / Newport Plum 20 20 reddish to scarlet Purple red foliage. Prunus cerasifera 'Krauter Vesuvius' / Flowering Plum 30 15 Upright growth, darkest foliage of the plums. Prunus cerasifera 'Thundercloud' / Plum 20 20 Dark purple foliage. Prunus x hillieri 'Spire' 30 10 orange red Prunus 'Snowgoose' / Snow Goose Cherry 20 20 Upright when young, spreading when older. Prunus serrulata 'Amanogawa' / Flowering Cherry 20 6 bronze Particularly useful for very narrow planting strips. Prunus serrulata 'Shirofugen' / Japanese flowering cherry 25 25 Deciduous flowering tree; moist, well-drained soils; double pink to white blooms in spring; vigorous grower; additional desirable choices include P. serrulata ‘Snowgoose’, ‘Kwanzan’, and ‘Shirotae’. Prunus x yedoensis 'Akebono' / Flowering Cherry 25 25 yellow DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB APPROVED TREE LIST – Small, Medium, and Large H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\treeslist_march2010.doc P. 5 Botanical name / Common Name Mature Height in Feet Mature Spread in Feet Fall Color Comments Quercus Ilex / Holly Oak 20 20 Prefers moist soils, but grows in varying soils; hearty, slow-growing evergreen tree; light pink flowers May-June; pruning will keep tree small for a hedge, without pruning may grow considerably larger – not appropriate under utility lines; tolerates salt water spray. Prune to keep small, leave it alone to grow large. Styrax japonica / Japanese Snowbell 25 25 yellow Plentiful, green 1/2 inch seeds. Styrax obassia / Fragrant Snowbell 30 25 Prefers moist, well-drained soil but tolerates wide variations; fragrant with flowers; twisting bark. Try other Styrax species. DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB APPROVED TREE LIST – Small, Medium, and Large H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\treeslist_march2010.doc P. 6 MEDIUM TREES: 30 to 50 feet in height Botanical name / Common Name Mature Height in Feet Mature Spread in Feet Fall Color Comments Acer campestre 'Evelyn' / Queen Elizabeth Maple 35 30 yellow More upright branching than the species. Acer platanoides 'Columnar' / Columnar Norway maple 40 15 yellow Deciduous; adapts to varying soils; upright or columnar in form making this cultivar a better choice for narrow locations; tolerant of drought and seasonal inundation; tolerates urban pollution and displays brilliant fall color; shallow rooting necessitates locating at least 4-6 feet from sidewalks and driveways to prevent heaving of pavement. Good close to buildings. Acer truncatum x A. platanoides 'Klethsform' / Norwegian Sunset 35 25 yellow- orange/ red Acer rubrum 'Bowhall' / Bowhall Maple 40 15 yellow orange Acer rubrum 'Karpick' / Karpick Maple 35-40 20 yellow to orange May work under very high powerlines with arborist's approval. Acer rubrum 'Scarsen' / Scarlet Sentinel Maple 40 20 yellow orange Acer rubrum / Red Maple 35-50 15-40 Deciduous tree known for fall color; prefer wet or moist soils; fast growing with roots that may heave sidewalks or interfere with mowing; many cultivars of varying heights available including: A. rubrum, 'Armstrong', 'Bowhall', 'Karpick', 'Scarsen', and 'Red Sunset'. Betula jacquemontii / Jacquemontii Birch 40 30 yellow White bark makes for good winter interest. Carpinus betulus 'Fastigiati' / Pyramidal European Hornbeam 35 25 yellow Fagus sylvatica 'Dawyck Purple' / Dawyck Purple Beech 40 12 Purple foliage. DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB APPROVED TREE LIST – Small, Medium, and Large H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\treeslist_march2010.doc P. 7 Botanical name / Common Name Mature Height in Feet Mature Spread in Feet Fall Color Comments Fraxinus americana 'Autumn Applause' / Ash 40 25 purple Deciduous; prefers moist, well-drained soils; dense, wide spreading canopy; long-lived; purple fall color; moderate growth rate; also try F. Americana 'Junginger'. Fraxinus oxycarpa 'Raywood' / Raywood Ash 35 25 reddish purple Pyrus calleryana 'Aristocrat' / Pear 40 45 red Pyrus calleryana 'Chanticleer' / Flowring Pear 40 15 Deciduous tree that grows well in a variety of soil types; orange to reddish fall color; white flowers in spring; additional cultivars of interest include P. calleryana 'Redspire' and 'Aristocrat'. Pyrus calleryana 'Redspire' / Pear 40 45 red Pyrus calleryana 'Autumn Blaze' / Pear 30 25 scarlet Vigorous. Ginko biloba 'Autumn Gold' / Maidenhair tree 45 35 yellow Moist soils; deciduous ornamental tree; fast growing and long-lived; tolerant of urban pollution, summer drought and winter inundation; showy fall color; grows in soils of varying quality; provides dense canopy; additional cultivars available. Ginko biloba 'Princeton Sentry' 40 15 yellow Very narrow growth. Gleditsia triacanthos inermis 'Shademaster' / Shademaster Thornless Honeylocust 45 35 yellow Deciduous; prefers moist, rich soils, but will grow in varying soil types; a thornless cultivar tolerant of drought and seasonal inundation; adapts to urban pollution and displays vigorous growth; deciduous tree with showy yellow fall color; additional cultivars available such as ‘Imperial,’ which grows 30-35 feet, ‘Moraine,’ and ‘Rubylace’. Do not confuse with 'Sunburst'. Koelreuteria paniculata / Goldenrain Tree 20-35 10-30 yellow Deciduous; prefers moist well-drained soils, but is tolerant of poor soils; medium rate of growth and longevity; tolerant of periods of drought and seasonal inundation; tolerates urban pollution; provides a dense, wide-spreading canopy. Midsummer blooming. Oxydendron arboreum / Sourwood 35 12 reddish purple Consistent and brilliant fall color. Prunus sargentii 'Columnarus' 35 15 orange to orange red The cherry with the best fall color. DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB APPROVED TREE LIST – Small, Medium, and Large H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\treeslist_march2010.doc P. 8 Botanical name / Common Name Mature Height in Feet Mature Spread in Feet Fall Color Comments Quercus 'Crimschmidt' / Crimson Spire Oak 45 15 Hard to find. Robinia x ambigua 'Idahoensis' / Pink Idaho Locust 35 25 yellow Fragrant flowers. Tilia americana 'Redmond' 35 20 yellow Pyramidal, needs water. Tilia cordata 'Chancole' / Chancelor Linden 35 20 yellow Pyramidal. Tilia cordata 'De Groot' / Linden 30-50 20 yellow Compact, suckers less than other Lindens. Tilia cordata 'Greenspire' / Greenspire Linden 40 30 yellowish Symmetrical pyramidal form. Tilia cordata 'Littleleaf' / Littleleaf Linden 30-50 30 Deciduous; prefers moist, well-drained soils, but tolerant of a variety of soil types; tolerant of wind and urban pollution; fast growing and long-lived; tolerates summer drought and seasonal inundation; provides a dense canopy; C. cordata is the hardiest Linden; many forms available including, T. cordata ‘Chancellor’, ‘Corzam’, and ’Greenspire’. DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB APPROVED TREE LIST – Small, Medium, and Large H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\treeslist_march2010.doc P. 9 LARGE TREES: 50 feet in height or taller Botanical name / Common Name Mature Height in Feet Mature Spread in Feet Fall Color Comments Acer freemanli / Autumn Blaze Maple 50 40 orange Abies grandis / Grand Fir 100 40 Evergreen; tolerant of fluctuating water tables and floods; medium rate of growth; root structure depends on site conditions – shallow in moist areas, deep taproot in drier conditions. Acer nigrum 'Green Colunm' / Green Column Maple 50 20 yellow to orange Good close to buildings. Acer platanoides 'Emerald Queen' 50 40 yellow Deciduous; fast growing with an erect, spreading form; prefers moist soils, but is tolerant of summer drought and seasonal inundation; tolerates urban pollution; avoid locating near structures due to shallow, vigorous rooting; additional cultivars available including A. platanoids ‘Parkway’. Acer pseudoplatanus / Sycamore maple 40-60 25-40 Deciduous; prefers moist, well-drained soils but is adaptable to may soil types; tolerates summer drought and seasonal inundation; tolerant of urban pollution with a moderate growth rate; sturdy, resistant to wind and salt spray; a number of cultivars are available including: A. pseudoplatanus ‘Atropurpureum,’ ‘ Brilliantissimum,’ ‘Cox’ (Lustre), and ‘Puget Pink’. Acer saccharum 'Bonfire' 50 40 bright orange red Fastest growing sugar maple. Acer saccharum 'Commemoration' 50 35 orange to orange- red Resistant to leaf tatter. Acer saccharum 'Green Mountain' 45 35 red to orange Acer saccharum / Sugar maple 60-75 35 yellow, orange Deciduous; prefers moderately moist, well-drained soils; long-lived and tolerant of urban pollutants; slow to medium growth rate; needs large planting area; a variety of cultivars available including Acer saccharum ‘Legacy’. DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB APPROVED TREE LIST – Small, Medium, and Large H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\treeslist_march2010.doc P. 10 Botanical name / Common Name Mature Height in Feet Mature Spread in Feet Fall Color Comments Calocedrus decurrens / Incense cedar 75-90 10-20 Evergreen; tolerant of poor soils; drought tolerant after established; tolerant of wind and urban conditions; narrow growth habit makes this a good choice for smaller spaces and ideal for screening, fragrant tree; slow growing and long- lived. Carpinus betulus / European Hornbeam 40-60 30-40 Deciduous tree: tolerant of urban pollution and poor soils; cultivars available and suggested include 'Fasigiata' (30-40 ft height) and 'Franz Fontaine' (30-35 ft height). Cedrus deodara / Deodar cedar 40-60 20-40 Evergreen; prefers moist, well-drained soils, but drought tolerant when established; fairly fast growing and long lived; dense, wide spreading canopy; attractive cultivars available. Cercidiphyllum japonicum / Katsura Tree 40-60 20-40 apricot, orange Deciduous; requires moist soil and does not do well on hot dry sites. Leaves are heart-shaped. Cercidiphyllum japonicum / Katsura Tree 40 40 yellow to orange Fagus sylvatica / Green Beech 50 40 bronze Silvery-grey bark. Fraxinus american 'Autumn Purple' / Autumn Purple White Ash 60-80 50-70 to a dark purple Deciduous; prefers moist well-drained soils but tolerates a range of soil types; Also try 'Rosehill'. Fraxinus latifolia / Oregon Ash 40-80 30 Deciduous; saturated, ponded or moist soils; flood tolerant; small green-white flowers; tolerant of poor soils. Fraxinus pennsylvanica / Green Ash 50 40 Deciduous; prefers moist soils; fast growth rate; salt, seasonal drought and urban pollution; numerous cultivars including'Patmore' (50-60 ft. height), 'Summit' (to 45 ft. height), and 'Urbanite' (to 50 ft. height). Fraxinus pennsylvanica 'Patmore' / Patmore Ash 45 35 yellow Extremely hardy, may be seedless. Fraxinus pennsylvanica 'Urbanite' / Ash 50 40 deep bronze Gleditsia triacanthos inermis 'Skyline' / Skyline Thornless Honeylocust 60-70 40 yellow Deciduous; prefers moist soils, but will grow in poor soils; tolerant of drought, seasonal inundation, and urban pollution; occasionally fruit pods can create litter during winter months; thornless. Do not confuse with 'Sunburst'. DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB APPROVED TREE LIST – Small, Medium, and Large H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\treeslist_march2010.doc P. 11 Botanical name / Common Name Mature Height in Feet Mature Spread in Feet Fall Color Comments Gymnocladus dioicus espresso / Espresso Kentucky Coffeetree 50 35 yellow Deciduous; drought and variable soil tolerant; seedless. Liquidamber styraci fleia / American sweetgum 60-75 40 Deciduous; prefers moist well-drained soils but tolerant of poor soils; drought tolerant after established; avoid major roadways and restricted sites. Many cultivars available. Liriodendron tulipifera / Tulip Tree 60-80 30-60 yellow Deciduous; prefers moist, deep, well-drained soils, but tolerates poor soils; fast growing; needs large growing area, lower growing cultivars available such as 'Columnar'. Fast-growing tree. Metasequoia glyptostoboides / Dawn redwood 70-100 25 Deciduous; prefers moist, deep, well-drained soils, but tolerates compacted and poor soils; long-lived, fast growing conifer; tolerant of seasonal inundation and drought; can grow in standing water; needles turn russet in the fall; needs large growing area; lower growing cultivars available such as M. glyptostroboides ‘Gold Rush’ and ‘Sheridan Spire’. Nothofagus antartica / Southern Beech 50 35 none Rugged twisted branching and petite foliage. Nyssa sylvatica / Tupelo 70+ 20 apricot to bright red Handsomely chunky bark. Picca omorika / Serbian spruce 50-60 20-25 Slow growing; tolerant of varying soils and urban pollution; moderately drought tolerant once established; elegant evergreen spruce, good for narrow locations; lower growing cultivars available. Pseudotsuga menziesii / Douglas fir 75-120 40 Evergreen conifer; moist to dry soils; long-lived with a medium to fast rate of growth; tolerant of summer drought, winter inundation, and poor soils; withstands wind and urban pollution; provides a nice canopy, but potential height will restrict placement. Quercus coccinea / Scarlet oak 50-60 45 brilliant scarlet to red Deciduous; grows in a variety of soil types; long-lived with a moderate growth rate; tolerant of summer drought and urban pollution; does not tolerate saturated soils or shade. DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB APPROVED TREE LIST – Small, Medium, and Large H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\treeslist_march2010.doc P. 12 Botanical name / Common Name Mature Height in Feet Mature Spread in Feet Fall Color Comments Quercus macrocarpa / Burr oak 70-80 30-40 Prefers moist soils, but is adaptable to varying soils; slow growing and long-lived; rugged looking deciduous tree; tolerant of seasonal drought and inundation; tolerates urban pollution and city conditions; provides a wide-spreading, dense canopy. Quercus phellos / Willow oak 60-70 50 Deciduous; prefers moist, well-drained soils, but grows in a wide range of soils types; long-lived tree with moderate growth rate and fibrous root system; tolerant of seasonal drought and inundation, as well as urban pollution; provides a wide-spreading, dense canopy; small delicate leaves. Quercus palustris 'Crownright' 80 40 More upright form of Pin Oak. Quercus robar / English oak 40-60+ 40 Prefers well-drained soil; slow to moderate growth rate; long-lived deciduous tree; tolerant of seasonal drought and inundation; tolerates urban pollution, poor soils and constrained root space; susceptible to powdery mildew; many varieties and cultivars available including: ‘Concordia,’ ‘Fastigiata,’ ‘Foliis Variegatis, and ’Westminster Globe.’ Quercus rubra / Northern red oak 60-75 50 Prefers moist, well-drained soils, but drought tolerant when established; tolerates seasonal inundation, urban pollution and salt spray; moderate rate of growth and longevity; provides a dense, wide-spreading canopy; susceptible to oak wilt fungus. Quercus shumardii / Shumard's oak to 70 50 Prefers moist, well-drained soils; deciduous, long-lived tree; tolerant of seasonal drought and inundation, urban pollution and poor soils. Taxodium distichum / Bald cypress to 75 40 Deciduous conifer; wet, mucky soils; tolerant of summer drought and seasonal flooding; will grow in poor soils; slow growing; long-lived with a wide-spreading canopy; roots do not appear to lift sidewalks as readily as other species; prune lower branches for sight-lines; cultivars include T. distichum ‘Shawnee Brave’. Thuja plicata / Western red cedar 200+ 60 Moist to swampy soils; evergreen tree tolerant of seasonal flooding and saturated soils; a good tree for screening; long-lived; cultivars ‘Pumilio’ and ‘Cuprea’ are shorter versions, ‘Aurea’ and ‘Atrovirens’ have distinctive foliage. Tilia americana x euchlora 'Redmond' / Redmond Linden 50 35 yellow Prefers moist, rich soils, but tolerant of a variety of soils; tolerant of seasonal drought and inundation, urban pollution and poor soils; deciduous tree resistant; also try 'Sentry' and 'Boulevard'. DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB APPROVED TREE LIST – Small, Medium, and Large H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\treeslist_march2010.doc P. 13 Botanical name / Common Name Mature Height in Feet Mature Spread in Feet Fall Color Comments Tilia plalyphyllos / Bigleaf linden 60-80 60 Prefers moist, well-drained soils, but grows in a variety of soil types; deciduous tree with medium growth rate; long-lived; tolerant of seasonal drought and inundation; tolerates urban pollutants; provides a wide-spreading, dense canopy; yellowish-white flowers attract bees. Tilia tomentosa / Silver Linden 40-75 25-45 Deciduous; prefers moist, well-drained soils, but drought tolerant when established; urban tolerant. Cultivars include 'sterlay' and 'Green Mountain'. Ulmus ssp. / Elm hybrids 50-60 35-50 yellow Deciduous; prefers moist, well-drained soils, but drought tolerant; rapid grower; a hybrid elm resistant to Dutch elm disease; suggested hybrids include ‘Accolade’, ‘Homestead’ and ‘Pioneer’. Ulmus 'Homestead' / Homestead Elm 60 35 yellow Ulmus parvifolia / Lace Bark Elm 50 40 Deciduous; prefers moist, well drained soils but tolerant of soil types and hot dry conditions. Flaking bark of orange, gray, green and brown color. Several cultivars including 'Allee' and 'Bosque'. Ulmus 'Pioneer' / Pioneer Elm 60 50 yellow Resistant to Dutch elm disease. Umbellularia californica / Oregon myrtle 40-75+ to 50 Prefers moist, well-drained soils; slow growing evergreen tree with aromatic leaves; tolerates seasonal drought and inundation; tolerant of urban pollution; provides a wide spreading, dense canopy; resistant to pests and disease; good for tall hedges or, when trunks are thinned, as a street tree; requires summer watering until established. DocuSign Envelope ID: 9A2B0C09-72D8-490B-A60E-EAD24B2FAACB