The previous owners of our house left several 2x4's in the garage. They were taking up space and I didn't want to just throw them out. So, I decided to build another mini-greenhouse.
I took my time building this one. I took accurate measurements and used a circular saw to make straight cuts. This structure is a lot more solid than the other one. I didn't include any diagonal bracing. I'm happy about this since the braces take up interior space in the other one.
After the frame was put together I stapled some plastic to it. I also added some handles. They were made from 6" pieces of 2x2 left over from the first greenhouse. They are a great addition. It's easy to move around. Once I get some more screws I plan to update the original one with some handles.
Here it is in place. I haven't added black fabric, a fan, or heat. For now I'll just keep what I have in the big mini-greenhouse. Then in a few weeks when stops going below freezing at night I'll put stuff in the small one.