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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. Zone Plant 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 Disclaimer: This page contains information from sources which ERsys.com does not control. If this page contains materials that are copyrighted or otherwise protected, please contact ERsys.com immediately. Copyright © 2000-2001 ERsys.com, All  Rights Reserved.

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