Conservation: Tree List

WORCESTER GARDEN CLUB

Recommended Tree Planting List for the
Asian Longhorned Beetle Quarantine Zone
and Surrounding Areas

Avoid planting host trees of the Asian Longhorned Beetle (ALB)

The following list has been compiled and organized according
to size by the Worcester Garden Club, April, 2009,

Assisted by Joann Vieira, Director of Horticulture, Tower Hill Botanic Garden. The resources for the list are APHIS (Animal and Plant Health Inspection Service), United States Department of Agriculture; research continues on the ALB. United States Department of Agriculture Forest Service, New Jersey Department of Environmental Protection, and N.J. Department of Agriculture, Tower Hill Botanic Garden, Worcester County Horticultural Society, Boylston, MA, Worcester Tree Initiative

Diversity of Species is Highly Recommended for Planting Sites

[ ] Indicates trees on the list but not recommended for urban plantings

Tower Hill Botanic Garden, 11 French Drive, Boylston displays 34 trees on this list.

A. COLUMNAR SHAPED TREES FOR CONFINED SPACES

  1. Serviceberry, Shadblow (Amelanchier ‘Robin Hill’ ‘Autumn Brilliance’)
    Example: Tower Hill Botanic Garden
  2. Hornbeam (Carpinus betulus
    C. betulus ‘Fastigiata’ example: Tower Hill Botanic Garden
    Carpinus betulus ‘Columnaris’
  3. Beech (Fagus ‘Fastigiata’)
    Example” Fastigiate beech on Burncoat St. at Quinsigamond Community College
  4. Ginkgo (Ginkgo biloba ‘Fastigiata’)
  5. Crabapple (Malus spp.)
    Research on Malus resistance to ALB is continuing
  6. Pyramidal English Oak (Quercus robur ‘Fastigiata’)
  7. American Arborvitae (Thuja occidentalis) ‘Emerald’ ‘Pyramidalis’
    ‘Nigra’example: Tower Hill Botanic Garden
  8. Upright White Pine (Pinus strobus ‘Fastigiata’) 50- 80′
    [“Suitable for large narrow planting spaces due to its upright form; Intolerant of air pollutants and salts; susceptible to white pine weevil”]
    Example: Tower Hill Botanic Garden
  9. Sargent Cherry (Prunus sargentii ‘Columnaris’)
    This species is on the APHIS list but other experts, Koller and Dirr, say it is not tolerant of extreme stress, not suitable street tree.
    * Research on Prunus resistance to ALB is continuing

B. SMALL TREES

  1. Katsuratree (Cercidiphyllum japonicum ‘Heronswood Globe’ 15′ tall
    Example: Tower Hill Botanic Garden- C. japonicum ‘Moiroika’s Weeping’
  2. Eastern Redbud (Cercis canadensis) 20-30′ tall, recommended cultivars: Royal White; Dwarf White grows 8-10′ Northern Strain, Forest Pansy
    Example: Tower Hill Botanic Garden
  3. White Fringetree (Chionanthus virginicus) 12-20′ tall, wide spreading
    Example: Tower Hill Botanic Garden
  4. Kousa Dogwood (Cornus kousa) 20-30′ tall
    Example: Tower Hill Botanic Garden
  5. Gray Dogwood (Cornus racemosa ‘ Cuyahoga’ and ‘Ottawa’) 10-15′ tall
    Example: Tower Hill Botanic Garden
  6. Hawthorn Winter King (Crataegus viridis ‘Winter King’) 20-30′ tall
    Example: Tower Hill Botanic Garden- C. phaenopyrum
  7. Crabapple (M. sargentii), M. ‘Snowcloud’, ‘Donald Wyman’ 15-20′ tall
    Example: Tower Hill Botanic Garden- M. ‘Donald Wyman’
    * Research on Malus resistance to ALB is continuing
  8. Merrill Magnolia (M. kobus var. loebneri ‘Merrill’) 20-35′ tall, 20-30′ wide
    Example: Tower Hill Botanic Garden
  9. Callery Pear (Pyrus calleryana) dwarf varieties that grow 15-20′
    Westwood (P. fauieri), Southworth (P. betulaefolia), Whitehouse * Research on Pyrus resistance to ALB is continuing
  10. Japanese Tree Lilac (Syringa reticulata) 20-30′ tall,
    Recommended cultivars include Ivory silk, Regent, Summer Snow Examples: Tower Hill Botanic Garden- a small S. reticulata, a larger S. pekinensis
  11. Stewartia (Stewartia spp.) Does not tolerate drought
    Examples: Tower Hill Botanic Garden, First Unitarian Church Of Worcester, 90 Main St, Worcester

C. MEDIUM SIZED TREES

  1. Ironwood, European Hornbeam (Carpinus betulus) 35-40′ tall
    Hornbeam (Carpinus caroliniana ‘Palisade’)
    Example: Tower Hill Botanic Garden- C. caroliniana
  2. American Yellow-wood (Cladrastis kentukea or lutea) 50′
    Sensitive to drought, canker
    Example: Tower Hill Botanic Garden
  3. Turkish Filbert (Corylus colurna) 45-60′ tall, no overhead interference
    Example:
  4. Carolina Silverbell (Halesia tetraptera) 30-40′ tall, grows best in partial shade
    Examples: Elm Park, Park Ave. Worcester; Tower Hill Botanic Garden
  5. Goldenraintree (Koelreuteria paniculata) 30-40 tall, tolerates urban stresses including drought, heat, wind, and air pollution
    * Research on K. paniculata resistance to ALB is continuing
    Example: Tower Hill Botanic Garden
  6. Magnolia (M. spp.) Tree form plants recommended for street plantings
    Example: Tower Hill Botanic Garden
  7. Crabapple (Malus sp.) * Research on Malus resistance to ALB is continuing
    Examples: Tower Hill Botanic Garden
  8. Amur Corktree (Phellodendron amurense) 35-45′ tall, fruitless male trees
    Example: Tower Hill Botanic Garden
  9. Swiss Stone Pine (Pinus cembra) 30- 40′ tall
    Example: Tower Hill Botanic Garden
  10. Cherry: Sargent Cherry (Prunus cerasifera)
    Purple Leaf Plum (Prunus cerasifera ‘Thundercloud’)
    Higan Cherry (Prunus subhirtella ‘Autumnalis’)
    * Research on Prunus resistance to ALB is continuing Example:
  11. Callery Pear (Pyrus calleryana) 30-45′ tall cv. Bradford NOT recommended
    Example: Tower Hill Botanic Garden- P. calleryana ‘Redspire’
    * Research on Pryus resistance to ALB is continuing
  12. Korean Stewartia (Stewartia koreana)
  13. [American Hophornbeam (Ostrya virginiana) Urban sensitivity]
    Example: Tower Hill Botanic Garden
  14. [Eastern Redcedar cultivars (Juniperus virginiana cv.) Alternate host for rust- do not plant near crabapples, hawthorns, or serviceberries]
    Examples: Some J. virginiana at Tower Hill Botanic Garden along former field edges

D. LARGE TREES FOR SPACES WITH NO OVERHEAD INTERFERENCE

  1. Katsuratree (Cercidiphyllum japonicum) 40-60′ tall
    Example: Tower Hill Botanic Garden- C. ‘Moiroika’s Weeping’
  2. Beech (Fagus spp.) May not be suitable for planting along streets;
    Examples: American Beech (F. grandifolia) nice stand on corner of Burncoat St and Millbrook St / North Service Road, on Wawecus School property European Beech (F. sylvatica) many nice specimens along Burncoat St. Tower Hill Botanic Garden- Fagus ‘Rohan’s Obelisk’
  3. Ginkgo (Ginkgo biloba) 50-80′ tall
    Example: Tower Hill Botanic Garden
  4. Honeylocust (Gleditsia triacanthos) 60-70’ tall;
    Thornless and reduced-fruiting varieties: Moraine, Shademaster, Skyline
    Example: Tower Hill Botanic Garden- G. triacanthos ‘Halka’
  5. Kentucky Coffeetree (Gymnocladus dioicus)
    Example: Tower Hill Botanic Garden
  6. American Sweetgum (Liquidambar styraciflua) Fruitless cv. Rotundiloba
    Examples: Tower Hill Botanic Garden- L. styraciflua ‘Rotundiloba’ Entrance to Greendale YMCA, 75 Shore Drive, Worcester
  7. Black Tupelo (Nyssa sylvatica) 90′, transplant small specimens
  8. Serbian Spruce (Picea omorika) 50-60′ tall
    Examples: in Burncoat neighborhood; Tower Hill Botanic Garden
  9. Oak (Quercus spp.)
    many examples in Burncoat / Greendale neighborhood English Oak (Q. robur) Q. robur ‘Fastigiata’ Pyramidal English Oak White Oak (Q. alba)
    Examples: Scarlet Oak (Q. coccinea),
    Red Oak (Q. rubra)
    Pin Oak (Q. palustris)
    Swamp White Oak (Q. bicolor) wet soils
    Examples: Tower Hill Botanic Garden grows several species
  10. Linden (Tilia spp.) many cultivars
    Littleleaf Linden (Tilia cordata)
    Example: Silver Linden (Tilia tomentosa) 50-70’ tall ‘Green Mountain’ and ‘Sterling’ Example: Tower Hill Botanic Garden
    * Research on Tilia resistance to ALB is continuing
  11. Baldcypress (Taxodium distichum) 60-80 tall
    Example: Tower Hill Botanic Garden
  12. Japanese Zelkova (Zelkova serrata ‘Green Vase’ and ‘Village Green’)
    Example: Tower Hill Botanic Garden
  13. White Fir (Abies concolor)
    Example: