I've been considering many options to grow things in the winter. It's not very hard because I'm in Phoenix, AZ, but we still get freezes now and then. First I was considering growing indoors, but decided that's not a very good option. I have settled on a greenhouse. I want about a 4x4x4 clear box for a single plant, but I don't know what material to use. Plexiglass is way to expensive. I'm starting to think saran wrap, but I don't know what to use as a cheap frame. Thanks!