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 willmottianum
Grows as airy mass of wiry stems 2 to 4 ft. high and wide. Deep green, 2-in.-long leaves are somewhat diamond shaped, with tapering tips; turn yellow or red and drop quickly after frost.
Grows as airy mass of wiry stems 2 to 4 ft. high and wide. Deep green, 2-in.-long leaves are somewhat ...
Native to Japan. Symmetrical, rounded habit; grows to 4 to 8 ft. high (or more) and as wide. Thick, sh...
China. Grows 15 to 20 ft., but can be held to 4 to 8 ft. New culms emerge green, but turn black in the...