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It's called the U.S. Department of Agriculture's "plant hardiness zone map," and it's the national standard for gardeners and growers to figure out which plants are most likely to survive the coldest winter temperatures in their location.

This week the map got its first update in more than a decade, and the outlook for many gardens looks warmer. The 2023 map is about 2.5 degrees Fahrenheit warmer than the 2012 map across the contiguous U.S., ...