Four pieces of treated wood into a square, triangle, etc... staked if possible, and then fill with compost. Keep treating wood with preservative and should last a long time. Our veg garden is raised beds, less bending over if high enough and you could have seats on edges depending on thickness of wood. Loads of ideas. Preparation is key. Our beds were put in 2000 and still going strong with repairs when necessary. I painted them blue just to be different with grey gravel round the outside. Looked lovely. Fruit trees around the outside.
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