APPENDIX E:  RECOMMENDED TREES
   Recommended Trees for Dublin, Ohio is designed to encourage an imaginative selection of landscape trees.  Careful selection will prevent an over-dependence on a few species.  This compilation will be useful to residents, nurserymen, horticulturists, landscapers, developers and landscape architects.  Planting and maintaining a diverse urban forest is the goal of Dublin's tree programs.  This idea is reflected in landscape plan approval by the Dublin Planning and Zoning Department and in tree planting and replacement by the Dublin Parks and Recreation Department.
   Along an individual street, uniform street tree plantings are desirable.  However, over-use of a few species is inevitable without a conscious effort to vary plant species and families. Diversity is achieved in Dublin by varying species selected for each street.  Information on street tree assignment is available from the offices of the Dublin Planning and Zoning Department and the Dublin Parks and Recreation Department.  Deviations from the recommended list are permitted with the approval of the Dublin Planning and Zoning Department.
   This list is divided into three size categories:  large trees which mature at a height of 50 feet or more (Group A);  medium trees reaching a mature height of between 30 and 50 feet (Group B);  and small trees which range from 10 to 30 feet at maturity (Group C).  Tree lawn sizes must accommodate the tree size planted:  Group A (> 7 ft.), Group B (4-7 ft.), Group C (3-4 ft.).  Use under utility lines is limited to small trees, although medium trees may be planted as close as 10 lateral feet to utility lines.
   The approximate mature height and diameter of each tree's crown are given.
   Trees are alphabetized by their scientific name with the common name given. Cultivars best suited to Central Ohio are also provided.  An asterisked entry indicates a tree which is unsuitable for planting within 15 lateral feet of a sidewalk or bikeway.
   Habit refers to the three dimensional form of the tree.  Six general terms describe the characteristic shape of the trees:
 
The tolerance category presents information from various sources listed in the bibliography.  The tree's relative tolerance to insects, diseases, pollution, and soil conditions are signified by either a “Y”, meaning yes, it is tolerant;  “N”, meaning no, it is not tolerant;  or  “-”, meaning no information is available from these sources.
   The comments pertain to any other notable characteristic of the tree.
APPROVED STREET TREES FOR COMMERCIAL/OFFICE/INDUSTRIAL SITES
REFER TO SEPARATE STREET TREE LIST
 
LARGE DECIDUOUS TREES (50 feet or greater) - GROUP A
Common Name
(Scientific name)
"Cultivar"
Height (ft.)
Spread (ft.)
Habit
Tolerance
Comments
insect/ disease
pollution
dry  soil
damp soil
Norway Maple
(Acer plantanoides)
   "Cleveland"
   "Emerald Queen"
   "Summer Shade"
40-50
40-50
globular
N
Y
Y
Y
dense shade and shallow roots inhibit turf
Red Maple
(Acer rubrum)
   "Autumn Flame"
   "October Glory"
   "Red Sunset"
40-60
40-50
ovoid to globular
Y
N
N
Y
suffers in urban environment; outstanding fall color
Sugar Maple
(Acer saccharum)
   "Green Mountain"
   "Legacy"
60-75
50-60
ovoid to globular
Y
N
N
N
attractive fall color
Black Adler
(Alnus glutinosa)
40-60
20-40
obovoid to globular
Y
Y
Y
Y
naturally a multi-stemmed tree; may prune to a single trunk
Sugar Hackberry
(Celtis laevigata)
60-80
50-60
globular
Y
Y
Y
Y
smooth bark
Katsura Tree
(Cercidiphyllum japonicum)
40-60
30-50
obovoid
Y
Y
N
Y
single or multi-stemmed; fall color an interesting apricot
American Yellowwood
(Cladrastis lutea)
30-50
40-55
obovoid
N
N
Y
-
white flowers; select those with wide branch angles
Turkish Filbert*
(Corylus colurna)
40-50
30-40
ovoid to conical
Y
Y
Y
Y
produces nuts in a sticky husk that are a delicacy to squirrels
Hardy Rubber Tree
(Eucommia ulmoides)
40-60
40-70
conical to globular
Y
Y
Y
Y
dark green canopy
White Ash
(Fraxinus americana)
   "Autumn Applause"
   "Autumn Purple"
50-80
40-70
irregular to globular
N
-
N
Y
beautiful fall color
Green Ash
(Fraxinus pennsylvanica)
   "Marshall's Seedless"
   "Summit"
50-60
30-40
irregular to globular
N
-
Y
Y
overplanted in Dublin
Autumn Gold Ginkgo
(Ginkgo biloba)
   "Autumn Gold"
50-80
30-60
conical to globular
Y
Y
Y
Y
a male variety which does not fruit
Kentucky Coffee Tree*
(Gymnocladus dioicus)
60-75
40-50
irregular to ovoid
Y
Y
Y
N
fruit may be objectionable; coarse texture
Sweetgum
(Liquidambar styraciflua)
   "Moraine"
60-75
40-50
conical to globular
Y
N
N
Y
messy star-shaped fruit
Larch
(Larix decidua)
70-75
20-30
conical
N
N
N
Y
deciduous conifer
Black Gum
(Nyssa sylvatica)
30-50
20-30
conical to ovoid
Y
-
Y
Y
brilliant fall color
Swamp White Oak
(Quercus bicolor)
50-60
50-70
ovoid
Y
Y
Y
Y
attractive scaly bark
Scarlet Oak
(Quercus coccinea)
70-75
40-50
globular
N
N
Y
N
red fall color
Shingle Oak
(Quercus imbricaria)
50-60
50-70
conical
Y
Y
Y
Y
leaves retained into winter
Red Oak
(Quercus rubra)
60-75
40-50
ovoid to globular
Y
Y
Y
Y
russet-red fall color
Shumard Oak
(Quercus shumardii)
70-75
40-50
ovoid to globular
Y
Y
Y
Y
a replacement for pin oak
Sassafrass
(Sassafras albidum)
30-60
25-40
conical to irregular
Y
Y
Y
Y
outstanding fall color
Bald Cypress
(Taxodium distichum)
50-70
20-30
conical
Y
Y
Y
Y
characteristic knees develop in wet soils
Redmond Linden
(Tilia americana)
   "Redmond"
40-50
25-30
ovoid
N
Y
Y
Y
Japanese beetles may attack foliage
Silver Linden
(Tilia tomentosa)
50-70
30-40
ovoid
N
Y
Y
Y
Japanese beetles may attack foliage
Urban Elm
(Ulmus X "Urban Elm")
50-70
25-40
obovoid
Y
Y
Y
Y
resistant to Dutch Elm disease
Lacebark Elm
(Ulmus parvifolia)
40-50
30-40
obovoid
Y
Y
Y
Y
exquisite mottled bark; resistant to Dutch Elm disease
 
MEDIUM DECIDUOUS TREES (30-50 ft.) - GROUP B
Common Name
(Scientific name)
"Cultivar"
Height (ft.)
Spread (ft.)
Habit
Tolerance
Comments
insect/ disease
pollution
dry soil
damp soil
Hedge Maple
(Acer campestre)
25-35
20-35
globular
Y
Y
Y
Y
dense canopy
Thornless Honeylocust
(Gleditsia triacanthos)
var. inermis
   "Imperial"
   "Morain"
   "Shade Master"
   "Skyline"
35-50
20-35
irregular to globular
N
Y
Y
Y
overplanted, use moderately; delicate form
Goldenraintree
(Koelreuteria paniculata)
30-40
30-50
globular
Y
Y
Y
Y
coarse texture
American Hophornbeam
(Ostrya virginiana)
25-40
20-35
conical
Y
-
Y
Y
transplant in spring
Amur Cork Tree
(Phellodendron amurense)
30-45
30-50
obovoid
Y
Y
Y
Y
broad-spreading
Sargent Cherry
(Prunus sargentii)
   "Columnaris"
40-50
30-45
globular
Y
-
-
-
stately bark; lovely early pink blossoms
Callary Pear
(Pyrus calleryana)
   "Aristocrat"
   "Chanticleer"
   "Red Spire"
30-50
20-35
conical to ovoid
N
-
Y
N
commonly planted "Bradford" exhibits poor branch structure leading to splitting
Sawtooth Oak
(Quercus acutissima)
35-45
35-45
ovoid to globular
N
-
Y
N
chestnut-like leaf shape
 
SMALL DECIDUOUS TREES (10-30 ft.) - GROUP C
Common Name
(Scientific name)
"Cultivar"
Height (ft.)
Spread (ft.)
Habit
Tolerance
Comments
insect/ disease
pollution
dry soil
damp soil
Trident Maple
(Acer buergerianum)
20-30
20-25
globular
Y
Y
Y
N
dark green leaf
Amur Maple
(Acer ginnala)
15-20
10-20
obovoid to globular
Y
Y
Y
Y
grown multi-stemmed or as a single trunk
Paperbark Maple
(Acer griseum)
20-30
10-30
globular to ovoid
Y
-
N
Y
unequaled bronze, exfoliating bark
Serviceberry
(Amelachier arborea)
15-25
7-10
obovoid
Y
N
Y
Y
early white flowers; delicate form; single or multi-stemmed
Fringe Tree
(Chionanthus virginicus)
10-20
10-20
obovoid
Y
Y
Y
Y
fragrant, white flowers; lovely tree when single-stemmed
Thornless Cockspur*
Hawthorn
(Crateegus crusgalli)
var. inermis
   "Crusader"
20-30
20-35
globular
N
Y
Y
Y
most cockspurs are dangerous, however, this one lacks thorns
Lavalle Hawthorn*
(Crataegus X lavallei)
15-30
10-25
globular
N
Y
Y
Y
nearly thornless; showy red fruit
Washington Hawthorn*
(Crataegus phaenopyrum)
25-30
20-25
globular
N
Y
Y
Y
thorns; red fruit persists into winter
Dotted Hawthorn*
(Crataegus punctata)
   "Ohio Pioneer"
25-30
25-35
globular
N
Y
Y
Y
few thorns; attractive bark large 1" fruit
Winter King Hawthorn*
(Crateagus viridis)
   "Winter King"
20-35
15-30
globular
N
Y
Y
Y
few thorns; fruit persists into winter; attractive bark
Japanese Tree Lilac
(Syringa reticulata)
   "Ivory Silk"
20-30
15-25
obovoid
Y
Y
Y
Y
flowers in June
Blackhaw Viburnum
(Viburnum prunifolium)
12-15
8-12
globular
Y
Y
Y
Y
blue-black fruit; prune to a tree form Crabapple
(Malus)
   "Adams"
20-25
-
globular
Y
Y
-
-
reddish pink flowers; red fruit
   "Baskatong"
30
-
-
Y
Y
-
-
purple-red flowers; dark purple-red fruit
   "Centurion"
20-25
-
columnar
Y
Y
-
-
rose-red flowers; cherry-red fruit
   "Donald Wyman"
20-25
20-30
globular
Y
Y
-
-
white flowers; red fruit
   "Harvest Gold"
20
15
obovoid
Y
Y
-
-
white flowers; gold fruit
   "Henningi"
25
-
obovoid
Y
Y
-
-
white flowers; orange-red fruit
   "Prairiefire"
-
-
-
Y
Y
-
-
red flowers; maroon fruit
   "Ralph Shay"
-
-
-
Y
Y
-
-
retains red fruit   "Robinson"25-obovoidYY--deep pink flowers; dark red fruit
   "Sentinel"
-
-
columnar
Y
Y
-
-
pale pink flowers; red fruit
   "Snow Drift"
15-25
-
globular
Y
Y
-
-
profuse white flowers; orange-red fruit; fire-blight in nearby states
   "Sugar Tyme"
18
15
obovoid
Y
-
-
-
white flowers; red fruit
   "Spring Snow"
20-25
-
obovoid
Y
-
-
-
white flowers; fruitless
   "White Angel"
20-25
-
obovoid
Y
-
-
-
white flowers; red fruit
   "Winter Gold"
30
-
-
Y
-
-
-
white flowers; yellow fruit
   UNACCEPTABLE TREES FOR STREET TREE USE
   Common Name   Scientific Name
   Box Elder   Acer negundo
   Silver Maple   Acer saccharinum
   Buckeye, Horsechestnut   Aesculus species
   Tree of Heaven   Ailanthus altissima
   Paper Birch   Betula papyrifera
   European White Birch   Betula pendula
   Northern Catalpa   Catalpa speciosa
   Ginko (female)   Ginko biloba
   Osage-orange   Maclura ponifera
   Apple   Malus punila
   Mulberry   Morus species
   Poplar   Populus species
   Bradford Pear   Pyrus calleryana "Bradford"
   Upright English Oak   Quercus robur "fastigiata"
   Black Locust   Robinia pseudoacacia
   Willow   Salix species
   European Mountain Ash   Sorbus aucuparia
   Moline American Elm   Ulmus americana "Moline"
   Siberian Elm   Ulmus pumila
   Number of varieties per street.  As a rule, streets are more attractive when they contain only one kind of tree.  In new allotments where an entire street is to be planted it is suggested that the property owners agree on a single variety. Although the planting along one street may be of a single variety, any one community should have a dozen or more kinds.  The use of several varieties adds interest to the street-tree plantings of the city and insures against the loss of all trees in case of an epidemic disease striking any one species.  The International Society of Arboriculture's “Diversification Formula” will be used as a guideline to prevent overplanting of a single tree species or family.  This formula states that, out of the total tree planting, no more than 10% should be from one family, and no more than 5% should be of one species.  Subdividers or developers are requested to consult with the Landscape Planner for a list of the current recommended street trees;  those from Appendix E, Recommended Trees for Dublin, and those species and/or families that do not exceed the Diversification Formula.
   Where to obtain trees.  Trees shall be nursery grown in accordance with good horticultural practices, and grown under climatic conditions similar to those in Central Ohio for a minimum of two years.  Trees shall meet current standards set by the American Association of Nurserymen and shall be freshly dug, have outstanding form and be free of disease, insects and/or damage.
   Planting and Care. In general it will be more satisfactory to engage a nurseryman, arborist or someone familiar with tree care to do the planting.  If the property owner does the planting, he/she should familiarize himself/herself with the requirements of successfully transplanting trees.  Information on shade tree planting and care can be obtained from the Dublin Planning and Zoning Department; the Ohio Department of Natural Resources, Division of Forestry, Columbus, Ohio; the Agricultural Extension Service, The Ohio State University, Columbus, Ohio; or the Ohio Agricultural Research and Development Center, Wooster, Ohio. Trees shall be planted in accordance with the requirements specified in § 152.138(A)(1) to (9) of the Dublin Planning and Zoning Code, and following the guidelines in the Dublin Planting Manual. Proper watering is extremely important for trees the first two years following transplanting.  During dry periods, add enough water to soak the soil to root depth once a week.  Transplanted trees can be overwatered; if the soil is heavy and drains poorly, the trees can be injured by too much water as well as too little. Bark mulch applied to the soil around the tree will help conserve moisture.
('80 Code, Appendix E)  (Am. Ord. 9-95, passed 3-6-95)