Sorry that didn't go according to your plans. I recommend you use a level if you try again, & not stacking more than 6 high. I stopped stacking them because I found that in my garden some of the pockets weren't getting enough sunlight, so I just tuck each tri-pot here and there where there is enough space, like in between my 17-20gal buckets & totes.
I was hoping this wouldn't happen if I filled a plastic tray (for catching excess water under pots) with some concrete, stick a rod in, and bury it. I haven't tried it yet
