I'm afraid the black plastic would cook the vegetable plants.Hey Bay, have you tried using that heavy duty black plastic or maybe that black rubber stuff that is used at nursery's? You would probably have to put a water line of some kind in since not enough rain would get through.
we just scrub them and cook the skins with the beets. the only parts we discard would be those areas that are thick, rough or damaged by bugs/critters (or us, but i guess we could qualify as a critter too ) and the bits of the top and bottom that we cut off.What are you feeding the beet skins to? Most of your critters would probably enjoy them. I remember the first time I fed the cooked beet skins to the chickens. The next morning I thought they were pooping pure blood before I remembered they'd eaten beet skins.