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Materials from nature are best for veggie beds

Q. Is pressure-treated lumber safe for building a vegetable bed, or should I use composite wood or stone blocks?

A. My preference is to use natural materials for building gardens that contain edible plants, and "natural" does not include chemically treated wood. Consider using fieldstone, which is flat, stacks well, fits curves and is ornamental. Use pieces 3 to 5 inches thick, and stack them three to four high. Concrete is available as preformed retaining walls at garden and home improvement centers. The structure should complement your other garden spaces.