Stenocarpus angustifolius Plant Care

Stenocarpus angustifolius (Stenocarpus angustifolius) belongs to the Proteaceae family within the Stenocarpus genus. Stenocarpus angustifolius is native to Queensland.

Stenocarpus angustifolius displays a tall, upright tree growth habit, reaching up to 30 ft tall with a spread of approximately 15 ft. Stenocarpus angustifolius produces showy clusters of red or orange tubular flowers.

Leaf size: approximately 6 inches.

Water a young or newly planted Stenocarpus angustifolius 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.

Stenocarpus angustifolius thrives in full sun to partial shade.

Stenocarpus angustifolius tolerates temperatures of 50–80°F. Stenocarpus angustifolius prefers humidity levels of 40–70%.

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

Feed Stenocarpus angustifolius every 8 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 acidic soil with high organic content, such as a mix of peat moss, pine bark, and perlite. Avoid low spots where water collects after rain.

Stenocarpus angustifolius is suited to USDA Zone 12a.

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.

Stenocarpus angustifolius can spread to about 15 ft (4.6 m) and reach about 30 ft (9 m) tall. Space plants about 15 ft (4.6 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 tree spacing calculator.

Prune Stenocarpus angustifolius 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.

Stenocarpus angustifolius is frost-tender (hardy to USDA zone 12). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Stenocarpus angustifolius can be propagated through seeds, semi-hardwood cuttings. Similar propagation techniques also apply to stenocarpus acacioides plant care, which shares the same genus.

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

Stenocarpus angustifolius 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.

Stenocarpus angustifolius grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Stenocarpus angustifolius is native to Queensland. In cooler regions, grow Stenocarpus angustifolius as a houseplant or bring it indoors before the first frost.