Christina, great question cloches, cold frames, and greenhouses can all be easily made out of glass and reused materials. Hoop houses can be made of many different materials. (I actually don't use plastic sheeting.) I find burlap to be one of the best materials, though it is not as much protection as the plastic sheeting would be. I also use frost blankets, which are warmer they hold out some moisture, but you'll probably want to go with glass for strong protection.,
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