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What you need:
  • Concrete blocks
  • Rubber mallet
  • String
  • Wooden stakes
  • Shovel
Set a string line that runs the entire length of the proposed border. Measure the length of the proposed border and divide it by the length of a single block. This will tell you how many blocks you will need.
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Now start laying down blocks to the outside of the string line. The blocks should be butted firmly against one another and the tops of the blocks should be flush with the string line. A rubber mallet can be used to properly position the blocks.
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Once all the blocks are in place, secure them by backfilling soil along the border's outside edge. Leave about 2" of the outside edge above the soil line. This allows mulch to be spread over the area after planting. Spread crushed gravel on the other side of the blocks to further secure the blocks in place and create a nice contrast.