Signs of frost damage on plants vary a little by plant. They can also be different from cold or chilling to deep freeze damage. It’s important to know the symptoms of cold and frost damaged plants to protect and recover those affected. How Cold is Too Cold for Plants? The lowest temperature a plant can withstand without damage varies from one type to another. Gardeners and horticulturists describe a plant’s ability to tolerate lower temperatures as cold hardiness. Most hardy plants go dormant during the winter and come back in spring. Exceptions include evergreens, which keep growing. In North America, the U.S. Department of Agriculture (USDA) zones describe cold hardiness by listing the regions in which a plant can grow outside year-round. There are eleven zones, with subzones, with the hardiest plants in zone 1 and tropical plants that won’t tolerate cold in zone 11. The USDA zones list the […]
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