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The United States Department of Agriculture (USDA) is in the process
of creating another version of the hardiness map using new mapping
technology and an extended set of meteorological data. Questions
about the revised USDA hardiness map should be directed to the
USDA’s Agricultural Research Service information office in
Beltsville, Maryland.
To view the 1990 version of the USDA Plant Hardiness Zone map,
click
here to be linked to the USDA’s National Arboretum Web site.
To view the AHS Plant Heat Zone Map,
click here.
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Horticultural Society. All rights reserved.
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