Hello.......I will be building some raised beds for growing veggies this year. We have a really short growing season, so I am looking for ways to extend it to produce more yield. Recently, I was given some 7' long double-chamber water tubes (made for pool covers). I know that the wall-o-waters are supposed to help protect the plants from the cold, so I was wondering if maybe these might be good to lay along side the plants to both keep the soil and the plants warm. What do you guys think?