H6 in. x W12 in. Large white flowers and compact form; the best of both its parents in an easily grown, fertile hybrid. 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.