|The cultivar, 'Arthur Simmonds' bears brilliant violet-blue flowers against muted, deep green leaves.
C. clandonensis is an deciduous shrub that has bright blue to purple, late summer flowers that attracts butterflies. Flowers appear on new growth, so cut back hard to the ground early each spring. Foliage is narrow and grey-green and is mildly fragrant as are the flowers and stems. Thrives in moderately fertile, well-drained soil, in full sun or part shade. Grows to 3 feet wide and 5 feet tall.