Rock Cress is a popular spring-flowering rock garden perennial. It forms a low carpet of evergreen leaves, literally smothered by flowers for several weeks. This selection has large flowers of brilliant blue. Excellent in the rock garden, cascading over walls, for edging or in alpine containers. This is a vegetative clone, so plants must be increased by division, best done in early autumn. Plants should be trimmed lightly immediately after blooming, to encourage a thick mounding habit.