Some of the greenhouses down in Tucson have them planted that way. I really don't like it. The plants seem uncomfortable to me! I think they do it because it is possible and some people like oddities and will buy them.
You know what might be fun to try upside-down is epi cactus. I mean they grow in trees and on rocks in the wild so upside-down isn't too much of a stretch.
Keeping them from falling out of the pot could be an issue, LOL.
A while back when searching for a plant ID, I ran across a picture of a group of epis...the poster had used 6 inch PVC pipe about 6 feet long (painted green) and used a hole saw to cut staggered holes...kinda like a spiral down the top to about 18 inches from the bottom. He used 3 of the plastic coated heavy metal garden stakes, sunk them in the ground and then slipped the pipe over the stakes, filled the pipe with planting medium and planted epis up the pipe like a strawberry pot. He had a few of them scattered through his garden...they were really striking.
That's an interesting idea. I have quite a few epi's. One I have is a really prolific bloomer, it would be really nice in a "pole" planter.
You know you could even make hanging pole planters for epi's. I have several Oak trees in my yard and could easily hang a perforated pole from one.
You could even add a built in watering system with access at the bottom of the pipe on larger pipes.
I thought it was pretty neat...and it looked so cool seeing the epis spilling down the pole...I went searching but couldn't find the pictures/link again...seems like a pretty basic idea though. He also had what looked like 4in clay sewer tiles cut to varying lengths and grouped together around his garden. They were full of succulents and small cacti and again made an interesting display
Talking about different kinds of planers. A friend of mine just bought some "on the wall" planters made out of what looks like rain gutter. I was thinking I could make a pretty cool "room divider" for outside with 3' sections of rain gutter mounted between some say 2x4's and then make a base by just bolting another 2x4 to the bottom.
Would make a really cool succulent planter.
That would work...I also saw one that used a couple old shutter style bifold doors and coir fiber sheets. The coir was used to make plant pockets and stapled to the slats...the design showed a few slats removed for air circulation/light and the two doors were left hinged with a board attached at the bottom for stability. I would think you could use a good weedblock cloth for the pockets also...Depending on location, a double sided wall would be neat for morning sun plants on one side...full sun plants on the other.