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Printer Friendly Version. Understanding the USDA planting zones you live in can mean the difference between success and failure in your garden. Planting plants, vegetables and flowers that are appropriate for your US growing zone will make sure that your garden is happy and healthy year after year.
Each of the gardening zones is based on a 10 degree Fahrenheit difference in the average annual minimum temperature. Planting Zones 1 and 2a, the coldest, represent Canada. The United States falls within zones 2 through 10. Hawaii and Mexico are represented by zone 11, the hottest zone.