Looking for plants suggestions that will trail down a high concrete retaining wall for each season ...zone 7, west facing, narrow planting space, not a lot of water...can be colourful or green
suggestions for top of retaining wall
I'd suggest trailing rosemary--I have it growing over the edge of retaining walls and it looks great as well as not needing much water.
You might also try posting in the Beginner Landscaping forum, more people will see it there so you will likely get more suggestions. http://davesgarden.com/community/forums/f/b_landscaping/all/