hydrangea and wisteria - both have varied flower colors. Both are also seen in Old Southern landscapes. Hydrangea like rich damp soil with filtered sun. Wisteria will seek out light and do well in full sun.
APLD 2010 International Landscape Design Merit Award Winner Richard G Shuster, RG Shuster & Company, Southampton, NY [Like tall narrow trees planted in a narrow ribbon of stones -- something similar for a b.