Blue Leadwort

Ceratostigma plumbaginoides (ser-ah-toh-STIG-mah plum-bah-gi-NOY-deez)

Family: Plumbaginaceae Non-native Groundcover (<1 ft)

Plumbago is an aggressively spreading, low, herbaceous perennial ground cover and a member of the thrift family (Plumbaginaceae). A native of China, in its natural habitat, the plant can often be found in rocky places and foothills. The genus name is compounded from the Greek “horned stigma” and presumably describes the appearance of the stigma. The species epithet means “like Plumbago ,” a related genus of tropical perennials. Plumbago will do well in sandy and loamy soils. It prefers well-drained, dry or slightly moist soil and can grow in nutritionally poor soil. It grows in full sun or partial shade and appreciates some afternoon shade on hot summer days, but cannot grow in full shade. To winter over in cooler climates, provide a light winter mulch. Plant it in rocky areas in full sun. Space plants 10 to 16 inches apart when you plant. The plant has an aggressive root system and can spread freely, however is not considered invasive. Plumbago typically grows 6 to 8 inches tall on generally erect stems rising from the rhizomes. Leaves have a beautiful bronze-red fall color, which contrasts beautifully with the sky-blue flowers and forms a very attractive ground cover. However, the leaves do fall in the winter. Flowers resemble those of woodland phlox. This plant is resistant to damage by deer. When growing in Zone 5, ensure to use mulch in the fall to protect from freezing temperatures. Use as an underplanting to shrubs or large perennials or with perennials that bloom early. Plumbago will fill in the void left by spent perennials. It inhibits the growth of weeds and other unwanted plants, which makes it an excellent choice as a ground cover. Its trailing, spreading habit makes it a great choice as a spiller in a 'Thriller, Filler, Spiller' container. Diseases, Insect Pests, and Other Plant Problems: No diseases or insect issues. Powdery mildew is an occasional issue as well as Citrus mealybug. Contact with this plant can cause contact dermatitis in some people. Caution should be used when pruning, and protective gloves should be worn. Bear in mind that, under the right conditions, it can spread aggressively.

Source: NC State Extension Gardener Plant Toolbox ↗ NC State Extension Gardener Plant Toolbox, 63 attributes.