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USDA Plant Hardiness Zone Map
This interactive document from the U.S. Department of Agriculture shows 10 different minimum temperature zones in the United States, Canada, and Mexico, "each of which represents an area of winter hardiness for the plants of agriculture and our natural landscape. It also introduces zone 11 to represent areas ... that are ... essentially frost free." Also includes information about the creation of the map, and indicator plant examples for selected woody plants.
http://www.usna.usda.gov/Hardzone/
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