The corner of our front flowerbed slopes down, creating a challenge to keep mulch in the bed and maintain a trench edge. I plan to expand and tidy the curve a bit as our small tree/focal point in that area grows. I prefer to maintain a natural edge rather than bring in edgers, but I’m curious if rocks could help here in some way? I don’t want to break the bank but it’s frustrating to rake mulch after every summer rain.