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USDA Plant Hardiness Zones

Plant Zone Index
According to the USDA, the plant hardiness index for is:


Background Information

How the map was started

Every plant can adapt to a range of environments. Gardeners have learned through experience where the great variety of landscape plants can be grown. Over the years many schemes have been proposed to help gardeners locate those environments when they introduce new species, forms, and cultivars. The pooling of many of these schemes culminated in the development of the widely used 'Plant Hardiness Zone Map,' under the supervision of Henry T. Skinner, the second director of the U.S. National Arboretum. In cooperation with the American Horticultural Society, he worked with horticulral scientists throughout the United States to incorporate pertinent horticultural and meteorlogical information into the map.

Indicator Plant Examples

The following are names of representative persistent plants listed under the coldest zones in which they normally succeed. Such plants may serve as useful indicators of the cultural possibilites of each zone.

ZonePlant Common Name
1
Below -50° F
Dwarf birch
Crowberry
Quaking aspen
Pennsylvannia cinquefoil
Lapland rhododendron
Netleaf willow
2
-50 to -40° F
Paper birch
Bunchberry dogwood
Silverberry
Eastern larch
Bush cinquefoil
American cranberry bush
3
-40 to -30° F
Japanese bayberry
Russian olive
Common juniper
Tartarian honeysuckle
Siberian crabapple
American arborvitae
4
-30 to -20° F
Sugar maple
Panicle hydrangea
Chinese juniper
Amur River privet
Virginia creeper
Vanhoutte spirea
5
-20 to -10° F
Flowering dogwood
Slender deutzia
Common privet
Boston ivy
Japanese rose
Japanese yew
6
-10 to 0° F
Japanese maple
Common box
Winter creeper
English ivy
American holly
California privet
7
0 to 10° F
Bigleaf maple
Kurume azalea
Atlas cedar
Small-leaf cotoneaster
English holly
English yew
8
10 to 20° F
Strawberry tree
Mexican orange
New Zealand daisy-bush
Japanese pittosporum
Cherry-laurel
Laurestinus
9
20 to 30° F
Asparagus fern
Tasmanian blue gum
Australian bush cherry
Fuchsia
Silk-oak
California pepper tree
10
30 to 40° F
Bougainvillea
Golden shower
Lemon eucalyptus
Rubber plant
Ensete
Royal palm


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Last modified on: Saturday, 26-Oct-2002 06:29:44 CDT