We picked this greenhouse up at Aldi for $30. It seemed so cheap that it didn’t matter if it was useless, but it’s turned out to be surprisingly good. Assembly was complicated, and it’s not at all rigid. The panels are polycarbonate formed like corrugated cardboard, which seems to give it good insulation. We had a 6 degree C night this week, and the temperature stayed above 10 C in the greenhouse, so I’ve put my Phalaenopsis orchids in (under shade cloth).
It’s against the North facing wall (which also holds a bit of heat) and I’ve put it on some cheap camping mat as it doesn’t have a base and the wind seemed to blow in under the pavers. It’s just over a metre long. In October I’ll give this greenhouse a try for raising basil seedlings.