HomeMy WebLinkAboutEx_07_Arborist_Report LAYTON TREE CONSULTING, LLC
It’s all about trees……
PO BOX 572, SNOHOMISH, WA 98291-0572 * 425-220-5711 * bob@laytontreeconsulting.com
ARBORIST REPORT UPDATE
4512 Talbot Road South
Parking Lot Expansion
Renton, WA
Report Prepared by:
Bob Layton
Registered Consulting Arborist #670
Certified Arborist #PN-2714A
July 29, 2022
Exhibit 7
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Arborist Report – 4512 Talbot Road S
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Table of Contents
Assignment.................................................................................................................................................... 3
Description .................................................................................................................................................... 3
Methodology ................................................................................................................................................. 3
Judging Condition...................................................................................................................................... 4
Observations ................................................................................................................................................. 4
Discussion/Recommendations ...................................................................................................................... 5
Tree Density-Tree Replacement ................................................................................................................... 5
Arborist Disclosure Statement ...................................................................................................................... 6
Attachments
Photos, pages 7 – 11
Tree Summary Table
Tree Plan Map
City of Renton – Approved Tree List
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Assignment
Layton Tree Consulting, LLC was asked to compile an updated Arborist Report for one parcel in Renton.
The subject property is located at 4512 Talbot Road South. The plan is to expand the existing parking
lot. I originally prepared a report for this site back in January of 2019 for the building renovation
project. 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 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: July 28, 2022
Description
There are two existing significant trees on the subject property. A significant tree is any tree with a caliper
of at least 6-inches or alder or cottonwood tree at least 8-inches. Both are located within the proposed
parking expansion footprint. These are comprised of a semi-mature Austrian pine and a small ornamental
flowering cherry.
There is a planted row of five semi-mature sweetgum trees at the front of the property adjacent to Talbot
Road. There are also three off-site trees within a proximity of the north property line. These right-of-way
and neighboring are not expected to be impacted by the proposed work.
Trees have been marked with a numbered aluminum tag, attached to the lower trunk by another party.
These same tag numbers are used for this report, and correspond with the tree numbers found on the
attached tree summary table and map.
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.
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• 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:
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
Observations
Tree #8171 is a semi-mature Austrian or black pine. The trunk forks at roughly 12-feet above ground
into codominant or equal diameter stems or tops. There is a moderate buildup of included or embedded
bark between the forked stems, as well as a small seam. This is a weak point on the tree. Vigor is good.
Foliage is of normal color and density. Overall condition is rated as ‘fair’.
Tree #8196 is a small variety of Japanese flowering cherry. It has grown to significant size since my last
site visit back in December of 2018. It is regularly pruned and maintained as a small, rounded,
ornamental specimen. It is in ‘good’ condition.
Right-of-way/Neighboring Trees
Trees #8163 > #8167 are semi-mature sweetgum trees adjacent to Talbot Road at the front of the
property. These have developed typical form for the species. Many have forked tops with weak ‘V’-
shaped attachments, which is common for the species. They are of good vigor for the most part. The
top foliage of Tree #8166 is somewhat sparse. Tree #8167 has a significant lean to the northwest
towards the road with an unusual small crack or seam at the base of the tree, see picture below.
Structural stability may be in question. The sidewalk that used to abut Talbot Road has been removed
and a new sidewalk constructed to the east.
There are two neighboring Western red cedar trees (#107 and #9) and a semi-mature red maple (#106)
on the adjacent property to the north. Tree #9 is situated close to the property line and could be
considered a boundary line tree. Both cedars are in good condition with no concerning defects. The red
maple is in fair condition with some decay in the lower trunk and a fork of the trunk with a moderate
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buildup of included or embedded bark between the forked stems. There is also some recent top
dieback of outer limb-tips.
Discussion/Recommendations
The two property subject trees are both within the new parking lot footprint. These will need to be
removed to facilitate the future proposed work.
A new sidewalk has been constructed east of the row of sweetgum trees. The old sidewalk immediately
west of the trees has been removed. This past work does not appear to have had any adverse impacts
on these trees. Tree vigor or vitality remains good. Position a tree protection barrier at the east edge of
the new sidewalk as shown on the attached map to continue to protect these trees during parking lot
expansion work.
Sweetgum tree #8167 has a noteworthy lean. There appears to be a stress crack at the base of the tree
that was not present a few years ago. The tree is positioned to fall onto the roadway should the roots
fail. The lean should be periodically monitored by the city. If the lean were to increase, immediate
removal would be recommended.
No work is proposed adjacent to the north property line. The existing curb and asphalt will be
maintained. No impacts are anticipated for neighboring trees to the north.
Apparently, the new driveway connection onto the property to the south, which is currently under
development, is in an area where replacement trees were proposed to be planted. These will need to
be relocated on the neighboring property if space allows. If the necessary planting space is not available
on the neighboring property, these replacement trees will need to be planted on the subject property.
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.
Tree Density-Tree Replacement
Consult with your City planner on supplemental tree planting/landscape requirements for the project.
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.
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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.
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Photo Documentation
Right-of-way sweetgum trees, new sidewalk on right, #8166 on left
Right-of-way sweetgum trees, #8163 on right
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New sidewalk/block retaining wall north of #8163, old sidewalk removed
Tree #8167 with lean to NW
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Tree #8167, unusual crack/seam at base (arrow)
Tree #8171
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Tree #8171, forked trunk with codominant stems
Tree #8196
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Neighboring tree #107
Neighboring tree #106
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Layton Tree Consulting LLC
For:Gardner
Site:4512 Talbot Road S - Renton
Tree Summary Table
Date:
Tree/DBH Height
Tag #Species (inches)(feet)Condition Comments Proposal
N S E W
8171 Austrian pine 23 60 12/10 12/12 11/10 14/12 Fair trunks forks at 12-feet above ground, weak attachment Remove
8196 flowering cherry 6 10 6/4 6/4 6/4 6/4 Good maintained at small size, good vigor Remove
Neighboring/Off-site Trees
8167 sweetgum 15 48 12 6 8/10 12 Fair heavy lean NW, unusual crack/seam at base Save/Protect
8166 sweetgum 16 50 16 14 14/10 16 Fair top foliage somewhat sparse Save/Protect
8165 sweetgum 16 50 12 12 12/12 14 Fair forked top, weak point on tree Save/Protect
8164 sweetgum 18 56 10 14 10/10 12 Good forked top, forked attachment appears sound Save/Protect
8163 sweetgum 20 56 18 14 16/12 14 Fair forked top, weak point on tree Save/Protect
106 red maple 19 34 NA 17/13 NA NA Fair forked trunk at 6-feet, weak attachment, 15-feet to curb Save/Protect
107 Western red cedar 20,21 52 NA 14 NA NA Good two trunks/stems, 13-feet to curb Save/Protect
9 Western red cedar 23 50 NA 12 13 12 Good good form and vigor, 10-feet from building Save/Protect
Drip-Line measurements from face of trunk
Drip-Line / Limits of Disturbance
(feet)
7/28/2022
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APPROVED TREE LIST – Small, Medium, and Large
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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.
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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.
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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
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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
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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.
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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.
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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.
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APPROVED TREE LIST – Small, Medium, and Large
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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’.
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APPROVED TREE LIST – Small, Medium, and Large
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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: 57BD3737-A63F-4813-88F2-F0381C7D329D
APPROVED TREE LIST – Small, Medium, and Large
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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'.
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APPROVED TREE LIST – Small, Medium, and Large
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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.
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APPROVED TREE LIST – Small, Medium, and Large
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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'.
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APPROVED TREE LIST – Small, Medium, and Large
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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: 57BD3737-A63F-4813-88F2-F0381C7D329D