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One handy trick for areas that you are having trouble visualizing a solution for, is to lay out a garden hose to help define the space. I laid one out with gentle curves and adjusted it until I could drive my riding mower along it without having to stop and back up. I also
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Once we were comfortable with the layout, we rented a sod cutter for removing the grass. Then we installed edgestone pavers along the border of the bed. (These are great for making curves.) I like to install a flat solid edging between the lawn and the edgestones. I find that this makes it easier to maintain a clean edge and keep the grass out of your bed. I used black plastic edging with a large bead at the top for the sides of the path. The path was constructed with flagstone that was “grouted” with decomposed granite. After this we installed the plants and mulch.
This area is now much easier to maintain. Added benefits include the reduction of thirsty lawn grass and more camouflage to pretty up my utility area.