I've been looking at a 6x8 greenhouse for $200. Heavy steel framing, mesh polyethylene cover. What I'm trying to figure out is hardening off plants in a greenhouse, from the sun. If I brought my plants up from the basement, and put them in a greenhouse, they wouldn't last long in the sun. Do you put the plants in the greenhouse for 1-2 hours, then throw a shade cloth over the top, gradually increasing the time in the sun without the shade cloth? Eventually, the plants would go in the ground. I just want to get the plants out of the basement sooner, and put them outside before plant out.