22 Years Later, USDA Releases New and Improved Map

Climate Central: Twenty-two years after its last revision, the U. S. Department of Agriculture finally released an update to the Plant Hardiness Zone map, which serves as a kind of detailed road map for gardeners, farmers, foresters, nurseries, or just about anyone who works with plants. The Plant Hardiness Zone Map, a useful tool for gardeners and researchers, was updated for the first time since 1990. Credit: U.S. Department of Agriculture. Last published in 1990, the new map illustrates the effects of global......

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