Thank you for reading my blog and sending in a great question. The way that we built the DG path seen in the photo below was to dig a shallow trench about 2 inches deep and about 4 inches wide. The rocks were then laid in the trench. Dirt was then packed around the rocks on the outside edge of the border, and the DG on the inside. Notice in the photo that there is no pattern to the rocks, some large, some small, none of them are perfectly lined up. This irregularity makes the path seem more natural.
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Photo by Doug Kalal, taken at a client's garden in San Carlos