Roylea cinerea Plant Care

Roylea cinerea (Roylea cinerea) belongs to the Lamiaceae family within the Roylea genus. Roylea cinerea is native to the Western Himalayas of Nepal and northern India.

Roylea cinerea displays an upright, spreading shrub growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Roylea cinerea produces small tubular flowers in shades of purple, pink, or white.

Leaf size: approximately 4 inches.

Water a young or newly planted Roylea cinerea 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.

Roylea cinerea thrives in full sun to partial shade.

Roylea cinerea tolerates temperatures of 60–80°F. Roylea cinerea prefers humidity levels of 40–70%.

Well-draining loamy soil with added compost for nutrients. Good drainage is essential for Roylea cinerea to prevent waterlogging, which leads to root rot and fungal issues.

Feed Roylea cinerea 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 loamy soil with added compost for nutrients. Avoid low spots where water collects after rain.

Roylea cinerea is suited to USDA Zone 13a.

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.

Roylea cinerea can spread to about 2 ft (0.6 m) and reach about 3 ft (1 m) tall. Space plants about 2 ft (0.6 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 Roylea cinerea 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.

Roylea cinerea is frost-tender (hardy to USDA zone 13). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Roylea cinerea can be propagated through seeds, stem cuttings.

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Roylea cinerea is susceptible to aphids, spider mites, whiteflies. 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.

Roylea cinerea grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Roylea cinerea is native to the Western Himalayas of Nepal and northern India. In cooler regions, grow Roylea cinerea as a houseplant or bring it indoors before the first frost.