New to the forums and New to maples, I have kept indoor bonsai for several years with some success. Recently I have decided I want to branch out and do some outdoor bonsai, I really like the look of maples. So I was hoping to give them a try. I live in zone 6a and have a patio that gets morning sun with afternoon and evening shade. My question is what do I need to do to winter them. I have a small backyard that could have a small greenhouse, but no unheated garage. Any tips would be appreciated.