Leaves injured by frost are silvery, and the upper leaf surface usually ruptures and separates from the underlying tissue.
Solutions
Lettuce is fairly tolerant to temperatures below freezing. With gradual drops in temperature, plants may escape injury. However, a sudden temperature drop will freeze and injure leaves. Symptoms appear within a few days. There is no practical control after symptoms occur. Plants can be protected from frost injury by covering them with floating row cover if freezing conditions occur during early growth.
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