'Annabel' is a double-petaled, pink sunrose growing about 4 to 6 inches tall and 18 or more inches across. The (nearly) evergreen foliage is small and fine, and silvery grey. The plant forms a tidy, compact mound that is attractive even when not in flower. Blooms in mid to late spring.
Grow in well drained soil and full sun to part shade. Deadheading isn't necessary, but cutting the whole plant back by a third in mid summer can result in more dense foliage and, sometimes, a second blooming in the fall, though it will be less showy. In mild winters, foliage may be evergreen, but summer sun may score the leaves; evergreen boughs are useful as a protective cover. There are helianthemum planted at the Washington Square Demonstration Garden.