I have just built a retaining wall (about 2 foot high) in my son's
garden. It faces south and we are looking for something to trail down
over the brickwork. Whatever we choose will probably need to look after
itself, but not spread too much. Aubrieta springs to mind. Dianthus
alpinus, Geranium cinereum, Helianthemum maybe? Any other low
maintenance suggestions? TIA