Saponaria ocymoides

(Rock Soapwort). Low growing, creeping plant, useful for spilling down sunny slopes or over rock walls. Plants form a low mound of bright-green leaves, literally smothered by starry pink flowers in late spring. Also useful as an edging in the sunny border, and worth considering in tubs or pots. Prune plants back hard immediately after blooming, to maintain a compact habit. Drought tolerant once established. Semi-Evergreen.