first developed by the united states department of agriculture (usda) as a rough guide to landscaping and gardening, a hardiness zone is a geographically defined area in which a plant is capable of growing and withstanding the minimum temperatures of the zone. the map is based on the average annual minimum winter temperature, divided into 5-degree f zones. keep in mind that local variations such as moisture, soil, winds, and other conditions might affect the viability of individual plants.
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