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草莓是多年生常绿草本植物,但因东北地区冬季气候严寒、植株被迫进行休眠越冬。据观察,裸露的草莓植株在零下9℃就会冻死,而在覆盖25厘米厚的雪层时,则能忍受零下25℃的低温。1983年冬季,丹东地区较干旱,结果有36％的草莓被冻死,个别地块冻死率达80％以上。因此,为了保证草莓的安全越冬,生产中普遍采取覆盖防寒。
Strawberry is a perennial evergreen herbaceous plant, but due to the cold winter in northeast China, the plants are forced to dormancy for winter. It has been observed that bare strawberry plants freeze to death at temperatures of minus 9 ° C and are able to tolerate temperatures as low as minus 25 ° C when covered with 25 cm of snow. In the winter of 1983, Dandong was drier and as a result, 36% of the strawberries were frozen to death. The freezing fatality rate of individual plots was over 80%. Therefore, in order to ensure the safety of strawberries overwinter, the production is generally taken to cover the cold.