Oh! I remember that lovely picture!
If you click it, it should have the link to the original site. I try to make sure whatever I post has linkbacks to where it was found (ALWAYS if I am the one posting it, though I admit I can be a little less observant if I am reblogging it from another poster).
Sorry! I’ve just found and reposted these, not actually made them myself! I believe that if you are using the rim, that creates your bottom and if not you just fill in with soil, or you can lay newspaper or weedblocker down as well. Hope that helps!