Iberis sempervirens

Evergreen Candytuft is a spring blooming favourite, often seen cascading over rocks and walls, or used as a groundcover. The glossy, evergreen foliage forms a billowing mound, with loads of good-sized white flowers for several weeks. Prune lightly right after blooming, but otherwise leave plants alone in fall and early spring. Drought tolerant, once established. Prefers a well-drained site, so avoid heavy clay soils that stay wet in winter. Not easily divided.