If blue is your color, Blue Plumbago (Plumbago auriculata) is the plant for you. This South American native is a relatively fast-growing, reliable perennial shrub that likes sun but can also bring wonderful color to partial-shade gardens. It reaches 36-48 inches tall and 30 inches wide. We spotted this one while visiting a yard sale in south Springfield, Missouri. We not sure of its varietal name, but it looks like 'Imperial Blue'.