African Rue Plant Care

African Rue (Peganum harmala) belongs to the Nitrariaceae family within the Peganum genus. African Rue is also known as Harmel, Wild Rue, Syrian Rue.

African Rue displays a spreading, bushy shrub growth habit, reaching up to 3 ft tall with a spread of approximately 4 ft. African Rue produces small white or yellow flowers in clusters.

Leaf size: approximately 2 inches.

Water a young or newly planted African Rue every 10–14 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.

African Rue thrives in full sun to partial shade.

Peganum harmala tolerates temperatures of 50–85°F. African Rue prefers humidity levels of 30–60%.

Well-draining sandy soil with low to moderate fertility. Good drainage is essential for African Rue to prevent waterlogging, which leads to root rot and fungal issues.

Feed African Rue 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 low to moderate fertility. Avoid low spots where water collects after rain.

African Rue is suited to USDA Zone 12a.

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.

African Rue can spread to about 4 ft (1.2 m) and reach about 3 ft (1 m) tall. Space plants about 4 ft (1.2 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 African Rue 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.

African Rue is frost-tender (hardy to USDA zone 12). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

African Rue can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to black cumin plant care, which shares the same genus.

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

African Rue is susceptible to aphids, scale insects, 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.

African Rue grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow African Rue as a houseplant or bring it indoors before the first frost.