I installed scalloped concrete edgers, approximately 24" long by 10" high. They look good, I spent much time to get them level and plumb, made a rock garden on the south side of my house 2 feet out from the basement wall and the length of the house. I lined it inside with landscaping fabric and them covered that with white landscaping rock, approximately 3-4 inches deep. Now, after one winter, the edgers have tilted out, no longer plumb. I wonder if water or snow caused the rocks to expand out, pushing on the inside of the edgers, thus causing them to lean out, or tilt.
I need to replumb these edgers. Do you think I need to replace the white landscaping rock with something less likely to cause this disturbance?
I hope my description is clear enough.