The frames themselves are fairly simple. Just regular lumber screwed together. DO NOT USE TREATED LUMBER – the chemicals will leach into the soil and contaminate the plants. The wood is sitting on TOP of the ground, so it should hold up for a long time. The fencing posts ARE treated (we couldn’t find non treated ones), but they are 0n the OUTSIDE of the framing (and aren’t sunk into the ground) so leaching shouldn’t be a problem.

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At the top of the list of reasons for wanting a raised bed was to get away from the clay soil. It seems that no matter how much you amend it, the clay just keeps rising to the surface. You would need to add about two feet of topsoil to have really good dirt, and frankly I don’t know how long that would last

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