Cleistanthus sumatranus Plant Care

Cleistanthus sumatranus (Cleistanthus sumatranus) belongs to the Phyllanthaceae family within the Cleistanthus genus.

Cleistanthus sumatranus displays a small tree or shrub growth habit, reaching up to 6 ft tall with a spread of approximately 4 ft. Cleistanthus sumatranus produces small greenish-yellow flowers in clusters.

Leaf size: approximately 4 inches.

Water a young or newly planted Cleistanthus sumatranus every 7–10 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established trees mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

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

Cleistanthus sumatranus tolerates temperatures of 65–80°F. Cleistanthus sumatranus prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining soil with high organic content, such as a mix of peat moss, perlite, and pine bark. Good drainage is essential for Cleistanthus sumatranus to prevent waterlogging, which leads to root rot and fungal issues.

Feed Cleistanthus sumatranus every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established trees 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 soil with high organic content, such as a mix of peat moss, perlite, and pine bark. Avoid low spots where water collects after rain.

Cleistanthus sumatranus is suited to USDA Zone 13b.

Plant container-grown or balled-and-burlapped trees in spring or early autumn, setting the root flare at soil level, and water well after planting.

Cleistanthus sumatranus can spread to about 4 ft (1.2 m) and reach about 6 ft (2 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 tree spacing calculator.

Prune Cleistanthus sumatranus 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 tree in one year.

Cleistanthus sumatranus 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.

Cleistanthus sumatranus can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to cleistanthus apodus plant care, which shares the same genus.

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Cleistanthus sumatranus is susceptible to spider mites, mealybugs, scale insects. 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.

Cleistanthus sumatranus grows outdoors in USDA Zone 13b. It survives winters down to planting zone 13b. In cooler regions, grow Cleistanthus sumatranus as a houseplant or bring it indoors before the first frost.