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YES, Cover them with plastic. You can build a quick 'hoop house" (think 'quonset hut' look) out of PVC pipe or even a small roll of fencing and cover it with the plastic; that will keep the plastic off of the plants. Cover them while they are still warm, don't wait for temps to drop so that you maintain the heat and have a mini-greenhouse effect. Even sticks to hold up the plastic will help. Make sure that the ends of the plastic are buried in the dirt or weighted somehow so no stray cold breeze gets through!
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