|The cultivar, 'Snowball' is true to type but bears white flowers.
C. rigidus is a compact, low-growing, broad, evergreen shrub. Leaves are oblong, glossy, dark green and finely toothed up to 2 inches long. Dark blue flowers are borne profusely in large lateral cymes up to 3 inches long. Excellent for a shrub border or against a sunny wall.