H6 in. x W24 in.  Lush mounds of scalloped and frilled foliage are covered with pale blue stars in early summer.  Hardy to Zone 6.

These justly popular rockery plants have differing needs, but are always rewarding. Most spread readily with underground runners or creeping stems; others are saxatile alpines, best grown in deep grit with a gravel collar. In general, they prefer gritty, well-drained soil and full sun to partial shade.