Groundcovers offer both form and function. They act as living mulch, suppressing weeds and controlling erosion. They also can tie a design together by acting as a unifying element. 

St. Johns Wort

Vigorous in tough conditions, Hypericum spp. has blue-green creeping foliage and sunny yellow flowers resembling large buttercups. Fleshy roots give drought-resistance but will want room to spread.

'Purple Prince'

Purple foliage to fill in and tie your design together.