INDICATOR TREES

ZONE    HARDINESS OF SOME TREES

9a      Magnolia grandiflora     Southern magnolia

8       Arbutus menziesii        Pacific madrone
8       Cornus nuttallii         Pacific dogwood

7b      Davidia involucrata      Dove tree
7       Liquidambar styraciflua  Sweet gum
7       Paulownia tomentosa      Royal paulownia

6b      Cornus florida           Flowering dogwood
6       Fagus sylvatica          European beech
6       Ailanthus altissima      Tree of heaven
6       Cercis canadensis        Redbud
6       Laburnum X watereri      Goldenchain

5b      Aesculus hippocastanum   Horse-chestnut
5       Acer platanoides         Norway maple
5       Quercus robur            English oak

4b      Cladrastis lutea         Yellowwood
4b      Ulmus glabra             Scotch elm
4       Ginkgo biloba            Maidenhair tree
4       Robinia pseudoacacia     Black locust

3b      Juglans nigra            Black walnut
3       Tilia cordata            Littleleaf linden

2b      Aesculus glabra          Ohio buckeye
2b      Celtis occidentalis      Hackberry
2b      Fraxinus americana       White ash
2       Betula verrucosa         European birch
2       Ulmus americana          American elm

1b      Salix pentandra          Laurel willow
1       Picea glauca             White spruce