The USDA Hardiness Zone Map has been used by gardeners to determine what plants will survive in their garden climate. The latest revisions by the American Horticulture Society, add zones and
take into consideration more than just annual low temperatures. Other hardiness measures include: length of cold spells in the winter, airflow patterns, the effect of large bodies of water like oceans and lakes and heat factors and how these things effect garden plants.
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[Source: About.com Gardening: Most Popular Articles]
