Lettuce could be placed in those wooden pallet planters as well, and pretty much any other small plant that doesn't take up too much root space.
The root cloth is to prevent the roots of my plants from reaching outside of the plants container area. I have folded a rectangle inside the container spaces. Perhaps in your area it's called by a different name, but it's a piece of black cloth that you could use about anywhere to prevent roots from going through in your garden.

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