Wow, I didn't realize I haven't been updating this thread. I'll post some photos later, but all four containers have been growing fantastic plants -- tomatoes, eggplants, peppers. I've been harvesting from them all, though only some of the peppers are just starting to change color and I made a mistake with one of the eggplants and set it back.
So it's a little early yet, but I came back to this thread to ask what you do with these containers for winter if you live where the winters are severe and freezing water in tubs could potentially crack them.
People in Florida are talking about prepping and planting them for fall gardening which will extend into winter. And they apparently just remove the plants, refresh the soil mix with additional fertilizer and dolomitic lime and topping them up with approved mix, sometimes rotate crops.
...but would I have to empty them, (I guess might as well clean them, too, then) and store them?
...could I just remove the plants, empty the water reservoir, then drag them off to a corner of the yard (if I can), let them dry out as much as possible and cover with tarp to protect from rain/etc.? I don't relish the idea of emptying and refilling these huge containers.....