Black-anthered Romulea Plant Care

Black-anthered Romulea (Romulea atrandra) belongs to the Iridaceae family within the Romulea genus. Black-anthered Romulea is native to South Africa.

Black-anthered Romulea displays a low rosette, clumping growth habit, reaching up to 0.5 ft tall with a spread of approximately 0.5 ft. Black-anthered Romulea produces small star-shaped flowers in various colors.

Leaf size: approximately 6 inches.

Water a young or newly planted Black-anthered Romulea every 7–10 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established shrubs mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Black-anthered Romulea thrives in full sun to partial shade.

Romulea atrandra tolerates temperatures of 50–80°F. Black-anthered Romulea prefers humidity levels of 40–60%.

Well-draining sandy soil with added organic matter like compost. Good drainage is essential for Black-anthered Romulea to prevent waterlogging, which leads to root rot and fungal issues.

Feed Black-anthered Romulea every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established shrubs in good soil often need little extra feeding, so let weak growth or pale foliage guide you.

Stop feeding by late summer so new growth can harden before winter.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Choose a spot with full sun to partial shade and well-draining sandy soil with added organic matter like compost. Avoid low spots where water collects after rain.

Black-anthered Romulea is suited to USDA Zone 8b – 10b.

Plant container-grown or balled-and-burlapped shrubs in spring or early autumn, setting the root flare at soil level, and water well after planting.

Black-anthered Romulea can spread to about 1 ft (0.2 m) and reach about 1 ft (0 m) tall. Space plants about 1 ft (0.2 m) apart so mature crowns don't crowd each other, and plant at least half that distance from buildings, fences and paths.

Planning a row or hedge? Try the plant spacing calculator.

Prune Black-anthered Romulea while it is dormant in late winter: first remove dead, damaged and crossing branches, then thin lightly for shape.

If it flowers in spring, prune right after flowering instead so you don't remove next year's buds. Never take off more than about a quarter of the shrub in one year.

Black-anthered Romulea is hardy down to USDA zone 8b, so once established it can stay outdoors through winter in that zone and warmer ones.

Water deeply in late autumn before the ground freezes, and spread a 5–8 cm (2–3 in) layer of mulch over the root zone, keeping it away from the trunk.

Young and container-grown shrubs need extra protection: roots in a pot freeze much more easily than roots in the ground.

Black-anthered Romulea can be propagated through by seeds or division of offsets. Similar propagation techniques also apply to columna's romulea plant care, which shares the same genus.

See all plants toxic to cats and plants toxic to dogs.

Black-anthered Romulea is susceptible to aphids, thrips, spider mites. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

Black-anthered Romulea grows outdoors in USDA Zone 8b – 10b. It survives winters down to planting zone 8b. Black-anthered Romulea is native to South Africa.