The USDA Plant Hardiness Zone Map divides North America up into zones that depict the average annual minimum temperature that can be expected in that zone. Plants, which have a minimum temperature at which they can survive, are then classified using those zones. For much more detail see the Hardiness Zone Map at the U.S. National Arboretum Web site.
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What are the USDA plant hardiness zones? Can you point me to a site that describes them?
Last Updated: January 22, 2012
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