Black frost, sometimes referred to as a "killing frost," is a meteorological term used to describe a weather condition where sub-zero freezing temperatures occur, but the relative humidity is so low that no visible white ice crystals or hoarfrost form on plant tissues. Instead of a protective layer of frost, the extreme cold causes plant cells to freeze, rupture, and turn completely black and limp as the vegetation dies, making it particularly devastating and deceptive for agricultural crops and gardeners.
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