Sterculia shillinglawii Plant Care

Sterculia shillinglawii (Sterculia shillinglawii) belongs to the Malvaceae family within the Sterculia genus. Sterculia shillinglawii is native to Papuasia and northeastern Australia.

Sterculia shillinglawii displays a tall, spreading tree growth habit, reaching up to 30 ft tall with a spread of approximately 20 ft. Sterculia shillinglawii produces small, bell-shaped flowers in clusters.

Leaf size: approximately 8 inches.

Water a young or newly planted Sterculia shillinglawii every 7–14 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.

Sterculia shillinglawii thrives in full sun to partial shade.

Sterculia shillinglawii tolerates temperatures of 65–85°F. Sterculia shillinglawii prefers humidity levels of 50–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining loamy soil with added organic matter for moisture retention. Good drainage is essential for Sterculia shillinglawii to prevent waterlogging, which leads to root rot and fungal issues.

Feed Sterculia shillinglawii 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 full sun to partial shade and well-draining loamy soil with added organic matter for moisture retention. Avoid low spots where water collects after rain.

Sterculia shillinglawii 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.

Sterculia shillinglawii can spread to about 20 ft (6.1 m) and reach about 30 ft (9 m) tall. Space plants about 20 ft (6.1 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 Sterculia shillinglawii 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.

Sterculia shillinglawii 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.

Sterculia shillinglawii can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to sterculia plant care, which shares the same genus.

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Sterculia shillinglawii is susceptible to aphids, scale insects, mealybugs. 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.

Sterculia shillinglawii grows outdoors in USDA Zone 13b. It survives winters down to planting zone 13b. Sterculia shillinglawii is native to Papuasia and northeastern Australia. In cooler regions, grow Sterculia shillinglawii as a houseplant or bring it indoors before the first frost.