Cape leadwort
Also known as
Cape plumbago, Blue plumbago, Plumbago capensis
Keep this plant’s care guide close at hand.
Get the appAbout Cape leadwort
Plumbago auriculata is an evergreen, scrambling shrub prized for its profuse sky-blue, phlox-like flowers borne in rounded clusters from spring through fall. Native to southern Africa, it forms arching, twiggy mounds 1–3 m tall, readily trained as a hedge, trellis climber, or spilling container specimen. Leaves are light green, with subtle ear-shaped lobes near the petiole, and the flower calyces are glandular-sticky, which helps seed dispersal and can catch on clothing. In warm climates it blooms nearly year-round, attracting butterflies and other pollinators. It tolerates heat, wind, salt spray, and short dry spells once established, yet thrives with regular water and fertile, well-drained soil. Where frost occurs, it may die back but often resprouts from the base in spring. Indoors or in cool regions, it appreciates bright light, pruning to contain vigor, and a period of reduced watering in winter. The sap can irritate skin, so handle pruning with care.
Taxonomy
Properties & Requirements
How to care for Cape leadwort
Water
Water deeply, then allow the top 2–5 cm (1–2 in) of soil to dry before watering again. In-ground plants become moderately drought-tolerant once established but flower best with regular moisture. In containers, water when the top 25–50% of the mix is dry, ensuring free drainage and emptying saucers. Reduce frequency in winter, especially indoors or when growth slows, to prevent root problems.
Light
Provide full sun for best flowering: at least 6–8 hours of direct light daily. It tolerates bright, open shade, but blooms lessen and stems become lanky. In very hot inland climates, light afternoon shade prevents leaf scorch and reduces water stress. Indoors, place at a south- or west-facing window, or supplement with grow lights to maintain compact, floriferous growth.
Nutrients
Feed during active growth (spring through early fall) with a balanced, slow-release fertilizer or a liquid 10-10-10 to 12-12-12 every 4–6 weeks. For heavier flowering, use a bloom-leaning formula slightly higher in potassium and ensure sufficient micronutrients, especially iron, in alkaline soils. Avoid excessive nitrogen, which drives leafy growth at the expense of blooms. Flush containers occasionally to prevent salt buildup.
Temperature
Ideal temperatures are 15–29°C (60–85°F). It is best suited to USDA Zones 9–11; brief light frosts may burn foliage, and hard freezes can kill top growth (often resprouting in spring). Protect from frost by mulching roots and moving containers indoors before temperatures drop below ~4°C (40°F). Overwinter indoors in bright light at 10–15°C (50–59°F) with reduced watering.
