|C. incana is very like C. clandonensis except that the leaves are aromatic and sharply dentated, and the flowers are usually in the purple-blue range but may sometimes be white. Foliage is narrow and grey-green and is mildly fragrant as are the flowers and stems.
This deciduous shrub 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.