Ceratostigma (ser-at-oh-stig-muh); Plumbago Family (Plumbaginaceae). Ceratostigma are perennials from China and Africa, having alternative leaves with hairy edges, and dark blue flowers in loose heads. Ceratostigma are valued in borders and rock gardens, especially for their late season flowers. They need full sun or partial shade and well drained soil.
C. plumbagininoides (plum-baj-in-oh-id-eez); Lead-wort, a 6 to 12 inch high perennial, with dark, shiny green leaves in a heavy, mat like growth. The foliage turns dark red in autumn. The funnel-shaped flowers, ½ inch across, are a fine, dark blue, well set off by the reddish bracts below each flower. Blooms begin in July and continue until frost. Lead-wort is useful as a low edging plant for perennial borders, in rock and wall gardens and as a ground cover.