I know that I have attached these pictures to previous discussions but here they are again, hoping to be helpful. I have collected the bath tubs from various places, Restore, etc. We have added one or two a year. My initial problem was ground squirrels that ate everything they could reach. Bathtubs on cement blocks solved that problem.
It does mean less planting area and because I garden on the roof of my earth sheltered home, everything gets more sun, more wind, more weather in general. I put brush and small sticks in the bottom of the latest four tubs, lots of dirt around wood, straw and chicken straw layered with compost and then (shamefully purchased) good garden dirt. (Note Costco’s huge bags of potting soil for about $7 each. I bought three, had to pull the dirt out of the bags, in the back of the Subaru, in smaller buckets full until I had emptied each enough to lift out.)
The tubs are at waist level, drain holes are adequate for drainage, and weeding is easy. I need more trellising for squash to climb but these are difficult to anchor in our rock heavy dirt. The hoop house is for tomatoes growing in stacks of tires. Cattle panels bent over a frame made of two by six boards is easy to cover and partially uncover as weather demands. The metal collars around the tires are probably less necessary now as I think the ground squirrels have thrown up their hands and left town. And sheet metal collars aren’t going to stop the pack rats that once hauled off an entire plant.
I had a lot of help getting the tubs up to the garden and lifted onto the blocks but now it’s a permanent installation and, at eighty, my gardening life is easier.
Whoops, apologies, I have lost the old photos, will get some more to sends today.