Chelle there was a nursery on our local news today that uses watering as a Frost Protection Method. They water the garden thoroughly before nightfall. The soil will release moisture into the air around your plants during the night, keeping the air somewhat warmer. Might best be left to the professionals. I would be afraid to try it in my garden. I have decided not to cover everything with sheets and if it does frost I am going to give your method a try.
