To maintain the soil away, you could also line the insides of the upstands utilizing black plastic liner. Claudia de Yong explains that though most raised beds are created from timber, even the strongest woods like oak or cedar will rot over time if not treated. You should consider drainage when constructing a raised gardenbed on a area of gravel or hardscape. Water must flow from the foundation of your raised garden bed onto the concrete or gravel.

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