Very simple but effectiveA bud has a mulch pile in his back lawn with a glass door simply laying over part of it. He hollows out a spot and grows stuff constantly. The decaying mulch provides heat constantly and the door keeps the frost off. Just a simple "greenhouse" but it works for them.
No. The important thing about using heirloom seeds to reproduce the next generation is in the seed. GMO's are modified so they can only be pollinated by other GMO seeds (that have a matching key). In the cases in the links above you are not actually reproducing. You are trimming and allowing to regrow.Sounds like a great thing to do but doesn't the original food item need to come from heirloom seeds..??..