Using clematis as a spillover plant
I know that typically clematis is used as a vining/climbing plant up and over trellises and walls, but has anyone had success with it as a spillover trailing down instead? I have a short retaining wall in my front yard, and I'm looking for a non-invasive spillover plant to put in the bed above it. Currently I have periwinkle, but it is very hard to keep under control because of its spreading. I would like a blooming plant that will not take over the rest of my flower bed and still trail down the wall. Thought maybe clematis, but not sure. Suggestions?