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.
Native to eastern China, Japan. Generally narrow and upright; to 15–50 ft. tall, 6–15 ft. ...
Grows at a moderate to fast rate, eventually reaching 40–80 ft. tall, with a heavy-limbed crown ...
Native to Taiwan. Forms a compact clump 2½½3½ ft. high and 3½4 ft. wide, wit...