Xanthostemon oppositifolius Plant Care

Xanthostemon oppositifolius (Xanthostemon oppositifolius) belongs to the Myrtaceae family within the Xanthostemon genus. Xanthostemon oppositifolius is native to Australia and Papua New Guinea.

Xanthostemon oppositifolius displays a compact, bushy shrub growth habit, reaching up to 5 ft tall with a spread of approximately 4 ft. Xanthostemon oppositifolius produces showy clusters of bright yellow flowers.

Leaf size: approximately 4 inches.

Water a young or newly planted Xanthostemon oppositifolius 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.

Xanthostemon oppositifolius thrives in full sun to partial shade.

Xanthostemon oppositifolius tolerates temperatures of 60–85°F. Xanthostemon oppositifolius prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining, slightly acidic soil with good organic content. Good drainage is essential for Xanthostemon oppositifolius to prevent waterlogging, which leads to root rot and fungal issues.

Feed Xanthostemon oppositifolius 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, slightly acidic soil with good organic content. Avoid low spots where water collects after rain.

Xanthostemon oppositifolius is suited to USDA Zone 10a – 12b.

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.

Xanthostemon oppositifolius can spread to about 4 ft (1.2 m) and reach about 5 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 Xanthostemon oppositifolius 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.

Xanthostemon oppositifolius 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.

Xanthostemon oppositifolius can be propagated through seeds, softwood cuttings. Similar propagation techniques also apply to xanthostemon arenarius plant care, which shares the same genus.

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

Xanthostemon oppositifolius is susceptible to aphids, scale insects, leaf miners. 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.

Xanthostemon oppositifolius grows outdoors in USDA Zone 10a – 12b. It survives winters down to planting zone 10a. Xanthostemon oppositifolius is native to Australia and Papua New Guinea. In cooler regions, grow Xanthostemon oppositifolius as a houseplant or bring it indoors before the first frost.