Answer: Plastic is not recommended as a frost protection. Try burlap, old sheets, blankets, or purchase frost cloths specifically designed for that use. Try to use some type of framework to drape the cloth over so it doesn't touch the plants. It should go completely to the ground to trap any rising heat absorbed by the soil during the day. Yes, the dark, withered leaves are frost damaged. Most root crops are hardy and should continue to grow. Good luck!
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