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She stacked bags of dry concrete in a row, then wet down the bags for a week or until the concrete hardened. Once hard, she tore off the paper wrapping. Then she stacked another row on top of the first, wetting the second row of concrete bags, waited for the concrete to harden and then removed the paper - and so on until she had her vegetables beds at a height that worked for her.
Make decorative concrete edging with a concrete mold and extra-strength, fiber-reinforced concrete mix