Iberis saxatilis

Iberis saxatilis, the rock candytuft, is a species of flowering plant in the family Brassicaceae, native to southern Europe and northwest Africa. The species is typically used as an ornamental rock and alpine garden perennial plant because of its decorative flowers and cascading growth habit. Iberis is so named because many members of the genus come from the Iberian Peninsula in south west Europe. The species name saxatilis means "growing among rocks," referring to the preferred substrate of this species....read more on Wikipedia.