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.
From Korea, Japan. This is a tropical-looking shrub with long-stalked, big, glossy dark green, deeply ...
Native to the western Mediterranean, this ground cover grows 2 to 4 in. high, spreading indefinitely b...
Native to Asia Minor. Tuberous-rooted plant to 1 1/2 –2 ft. tall and wide, with fresh green, alm...