Valued for clusters of intense blue, phloxlike flowers that bloom in summer to late fall, when cool hues are often especially welcome in the garden. (For pale blue-flowered Cape plumbago, see Plumbago auriculata.) Tolerates inconsistent watering. Shrubby species are usually treated like perennials in colder zones; cut them back after bloom and apply a thick mulch.Ceratostigma griffithii
Himalayan native that grows 2 1/2 to 3 ft. high and wide, with roundish, deep green leaves. Even light frost will nip back the growth on this plant. Blue, phlox-like flowers appear in fall.
China. Grows 15 to 20 ft., but can be held to 4 to 8 ft. New culms emerge green, but turn black in the...
Reported to be a hybrid between Ligustrum japonicum ‘Rotundifolium‘ and Ligus...
Hybrids between the P. aequalis and P. capensis. Grow 2-4 ft. high and wide. Mostly ...