Instructables

Step 7: Connecting the PVC

Picture of Connecting the PVC
Screw in threaded adapters to threaded elbow end. Attach the remaining 5 foot sections of pipe to the adapters to complete the frame. If you want a temporary structure, do not glue the bottom of your greenhouse pipe together. However, you will need duct tape or cement blocks to brace the base of your greenhouse. If you are using it out in the yard, you can also anchor it down with camping tent spikes.
HiFiGator2 years ago
I just joined the party specifically to add this comment, so hopefully it might help somebody. I have been looking at numerous different plans for cheap greenhouses online all day long. For the most part, I like yours best congrats! But I did like one idea that I'm going to steal from another site, and I think it fits in perfectly here. You can kill two birds with one stone. The simple idea is to take pieces of rebar that are about a foot long and then pound them into the ground about halfway, leaving 5 or 6 inches sticking straight up out of the ground. Then use those as your anchor to attach the interior pvc supports to. The pvc is a good snug fit sliding over rebar. I don't know how to link pictures and so forth yet, so I hope I can explain it well enough. But basically, this will help anchor the greenhouse down for stability, plus you won't have any PVC running across the "floor" to trip over in the middle of the greenhouse. Incidentally, scrap pieces of rebar can be found at almost any construction site and pieces like that are just trash to them. You can also get them for free from concrete plants. Again, they are basically a nuisance to what they do. (I hope this is still true. I know it was before, but with the recent boom in scrap metal pricing, maybe the rebar is now "worth" something to them.

In any case, I hope this might help.