Prized for brilliant blue blossoms in summer and fall and round foliage that glows with autumn colors, these resilient plants survive in full sun in water-retentive soils even without summer irrigation. C. griffithii is a twiggy, slowly spreading evergreen shrub. C. willmottianum spreads by underground runners to form a thicket; deciduous stems turn brown in winter and must be cut to the ground before spring. C. plumbaginoides, known as dwarf plumbago, is a deciduous slowly spreading groundcover that requires shearing in winter.