Compact, arching shrub to nearly 1 m tall and 1 m wide. Flowers mid-blue.
Upright shrub 2-3 m tall with glossy, dark leaves to about 7 cm long. Flowers prolific, deep blue; spring to early summer (C. griseus × ?C. papillosus).
Spreading shrub to about 1.5 m tall. Leaves to 2.5 cm long. Flowers clear blue in spikes generally more than 10 cm long.
Densely branched shrub with small leaves. Flowers deep indigo in clusters to 2.5 cm long; spring.
Shrub to about 0.5 m tall and spreading to about 3 m wide. Flowers exceptionally prolific, bright clear blue.a cultivar of C. griseus var. horizontalis.