|I planted a fall garden and everything is, or was coming up beautifully. The last several nights I have been covering the plants with 6 mil plastic sheets. Last night we had a hard frost. Most of the leaves are extremely cold and stiff, some appear to have frost on them. I 've done some research in your Q & A section and found that I should have had an insulating air section. How do I tell if the plants are damaged, by withered, darkened leaves later in the day? Are my underground vegs (beet, turnip, kolrabi, and carrots) damaged as well or will they continue to grow?