I have also seen where the actual bags of soil werre laid on the ground and the tops slashed and the plants were set out directly into the bags of soil. I suppsoe you might also need to poke some holes in the bottom side that was on the ground for some drainage. Just thought I’d share the idea.
I like the idea of combining plants in one container – a few corn stalks, green beans (or other climbing vine), and then something like carrots or radishes. I have some old horse feeder, wheel barrow, and a cracked birdbath that wont hold water is getting re-purposed.