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What you need:
  • Concrete blocks
  • Wooden stake or rebar
  • String
  • Rubber mallet
In order to have a truly circular border you first need to determine the center point of the area. Once you have a preliminary shape etched out, drive two stakes into the ground at the edge of the proposed circle. The stakes should be directly opposite one another, and should roughly bisect the area. Use a measuring tape to determine the exact middle point between the two stakes. Drive a stake into the ground to mark the center point.
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Tie a length of string to the center post. To determine the length of the string, measure the distance between the middle post and either of the outside posts. Next, attach a stake to the loose end of the string. Pull the string taut and walk the circumference of the circle using the stake to mark the outside edge of the border.
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Once you have determined the exact shape of the border start laying down the concrete blocks. Place the blocks snugly up against one another following the outline you made with the stake. If the tops are not flush with one another you can gently tap on the tops of the blocks with a rubber mallet to position them better.
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After all of the blocks are in place, you will need to secure them by back filling soil against one side of the blocks. Which side of the blocks you pile the soil against is determined by the use of the border. If your intention is to create a circular flowerbed with a walkway on the outside, the soil should be placed on the inside edge of the blocks. If you wish to create a circular walkway within a flowerbed then back fill along the outside border. In either case the soil level should be about two inches lower than the top of the blocks. This will allow for mulch to be spread over the area.