Ruellia dioscoridis Plant Care

Ruellia dioscoridis (Ruellia dioscoridis) belongs to the Acanthaceae family within the Ruellia genus. Ruellia dioscoridis is native to Yemen. Ruellia dioscoridis is also known as Wild Petunia.

Ruellia dioscoridis displays a low rosette, spreading ground cover growth habit, reaching up to 2 ft tall with a spread of approximately 2 ft. Ruellia dioscoridis produces tubular flowers in shades of purple, pink, or white.

Leaf size: approximately 3 inches.

Water a young or newly planted Ruellia dioscoridis every 7–14 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.

Ruellia dioscoridis thrives in bright indirect light. Avoid placing Ruellia dioscoridis in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Ruellia dioscoridis tolerates temperatures of 65–85°F. Ruellia dioscoridis prefers humidity levels of 40–60%.

Well-draining, fertile soil with added organic matter like compost or peat moss. Good drainage is essential for Ruellia dioscoridis to prevent waterlogging, which leads to root rot and fungal issues.

Feed Ruellia dioscoridis every month 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 bright indirect light and well-draining, fertile soil with added organic matter like compost or peat moss. Avoid low spots where water collects after rain.

Ruellia dioscoridis is suited to USDA Zone 10b – 12b.

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.

Ruellia dioscoridis can spread to about 2 ft (0.6 m) and reach about 2 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 Ruellia dioscoridis 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.

Ruellia dioscoridis is frost-tender (hardy to USDA zone 10). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Ruellia dioscoridis can be propagated through seeds, division of clumps, stem cuttings. Similar propagation techniques also apply to shortleaf ruellia plant care, which shares the same genus.

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Ruellia dioscoridis 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.

Ruellia dioscoridis grows outdoors in USDA Zone 10b – 12b. It survives winters down to planting zone 10b. Ruellia dioscoridis is native to Yemen. In cooler regions, grow Ruellia dioscoridis as a houseplant or bring it indoors before the first frost.