Sarcanthus rostratus Plant Care

Sarcanthus rostratus (Sarcanthus rostratus) belongs to the Orchidaceae family within the Sarcanthus genus. Sarcanthus rostratus is native to Cambodia, Laos, Thailand, Vietnam and China.

Sarcanthus rostratus displays a low rosette, spreading ground cover growth habit, reaching up to 0.5 ft tall with a spread of approximately 1 ft. Sarcanthus rostratus produces small tubular flowers in shades of blue, purple, or white.

Leaf size: approximately 3 inches.

Water a young or newly planted Sarcanthus rostratus every 5–7 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.

Sarcanthus rostratus thrives in partial shade to dappled sunlight. Avoid placing Sarcanthus rostratus in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Sarcanthus rostratus tolerates temperatures of 60–75°F. Sarcanthus rostratus prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining sandy soil mix with added organic matter for moisture retention. Good drainage is essential for Sarcanthus rostratus to prevent waterlogging, which leads to root rot and fungal issues.

Feed Sarcanthus rostratus 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 partial shade to dappled sunlight and well-draining sandy soil mix with added organic matter for moisture retention. Avoid low spots where water collects after rain.

Sarcanthus rostratus 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.

Sarcanthus rostratus can spread to about 1 ft (0.3 m) and reach about 1 ft (0 m) tall. Space plants about 1 ft (0.3 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 Sarcanthus rostratus 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.

Sarcanthus rostratus 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.

Sarcanthus rostratus can be propagated through division, stem cuttings, seeds.

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Sarcanthus rostratus is susceptible to spider mites, aphids, 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.

Sarcanthus rostratus grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Sarcanthus rostratus is native to Cambodia, Laos, Thailand, Vietnam and China. In cooler regions, grow Sarcanthus rostratus as a houseplant or bring it indoors before the first frost.