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Sometimes called “growing zones” or “gardening zones,” hardiness zones refer to a map developed by the USDA that separates the United States into regions based on the average low winter temperatures.

Get any of our free daily email newsletters — news headlines, opinion, e-edition, obituaries and more. This winter, when you're studying gardening magazines and seed catalogs to decide what to plant ...

Gardeners should always look at their growing climate before choosing plants for their landscapes. The USDA Plant Hardiness Zone Map is the standard by which gardeners can determine which plants are ...