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Place wooden or pvc stakes
Place wooden or pvc stakes around the garden area you want to protect from freezing. Length of stakes should be long enough to go into ground about 6-8 inches and stand about 2-3 inches above tallest plants. Purchase large size plastic sheeting (the greater the thickness of plastic, the better the insulation) from a hardware store. Drape sheeting over plants, place rocks or other heavy items along perimeter of sheet to keep it in place. Makes a very good "hot house" and protects plants down to about 25 degrees (overnight temp with a warm day).