Planted on top of a wall, these plants spill over the edge for a dramatic, cascading effect. They all do well without supplemental watering, which can increase soil pressure on the wall. Shown: Fairy rose (Rosa polyantha
This disease-resistant rose has shiny green leaves and profuse pink clusters of summer blooms. Grows up to 3 feet high and wide in Zones 5 to 9.
About $25; Moody's Nursery