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National Gardening Association :: National Gardening Association

Practical Environmentalist found this 3/17/2009 on garden.org

USDA Hardiness Zone Finder The USDA Hardiness Zone Map divides North America into 11 separate zones; each zone is 10°F warmer (or colder) in an average winter than the adjacent zone. If you see a hardiness zone in a catalog or plant description, chances are it refers to the USDA map. To find ...