I built raised beds this past February. The site where I wanted the garden had lost a lot of the top soil due to construction, and I was down to that crappy white clay subsoil. The raised bed design I went with is 4x8 and 18" deep. I filled mine to 15" deep and the remaining 3" allowed me to apply a nice layer of mulch. Don't go cheap on what you buy to fill them with. I didn't, and I regret nothing.
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