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 to 2 1/2–3 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.
Low, spreading plants to 3 in. high and 2 1/2 ft. wide. Broad dark green leaves. Bright pink, burgundy...
Prostrate plants to 4 in. high and 1–1 1/2 ft. wide, with finely cut dark green leaves. Wide ran...
From South Africa. Woody-based perennials that die to the ground in cold climates, remain shrubby in m...