Purple beardtongue Plant Care

Purple beardtongue (Purpureostemon ciliatus) belongs to the Myrtaceae family within the Purpureostemon genus. Purple beardtongue is native to New Caledonia. Purple beardtongue is also known as Smooth penstemon.

Purple beardtongue displays a compact, upright shrub growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Purple beardtongue produces small white flowers in clusters.

Leaf size: approximately 4 inches.

Water a young or newly planted Purple beardtongue 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.

Purple beardtongue thrives in partial shade to full sun.

Purpureostemon ciliatus tolerates temperatures of 60–80°F. Purple beardtongue prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining acidic soil with high organic content. Good drainage is essential for Purple beardtongue to prevent waterlogging, which leads to root rot and fungal issues.

Feed Purple beardtongue 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 full sun and well-draining acidic soil with high organic content. Avoid low spots where water collects after rain.

Purple beardtongue is suited to USDA Zone 10b – 11b.

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.

Purple beardtongue 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 Purple beardtongue 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.

Purple beardtongue 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.

Purple beardtongue can be propagated through softwood cuttings, air layering.

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

Purple beardtongue 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.

Purple beardtongue grows outdoors in USDA Zone 10b – 11b. It survives winters down to planting zone 10b. Purple beardtongue is native to New Caledonia. In cooler regions, grow Purple beardtongue as a houseplant or bring it indoors before the first frost.