Warmer temperatures make new USDA plant zone map obsolete

Gardeners and landscapers may want to rethink their fall tree plantings. Warming temperatures have already made the US Department of Agriculture's new cold-weather planting guidelines obsolete, according to Dr. Nir Krakauer, assistant professor of civil engineering in The City College of New York. He developed a new method to map cold-weather zones and overhauled the USDA's latest plant zone map.

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