Leaves injured by frost are silvery, and the upper leaf surface usually ruptures and separates from the
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.
injury to lettuce leaf