It can be a raised beds without buying materials to build sides. I started my raised beds as just piled up soil with predetermined, set paths. The first sides I used were made from tree trimmings, driving in pegs made from the thicker stuff and then weaving the thinner stuff in and out around the pegs. Over time, I used whatever materials became available. Right now, my raised beds are surrounded with what used to be shelving, from a video store that closed.
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