Australian Hazel Plant Care

Australian Hazel (Symplocos costata) belongs to the Symplocaceae family within the Symplocos genus. Australian Hazel is native to Sumatra.

Australian Hazel displays an upright, spreading shrub growth habit, reaching up to 6 ft tall with a spread of approximately 4 ft. Australian Hazel produces small, fragrant white flowers in clusters.

Leaf size: approximately 4 inches.

Water a young or newly planted Australian Hazel 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.

Australian Hazel thrives in partial shade to full sun.

Symplocos costata tolerates temperatures of 50–85°F. Australian Hazel prefers humidity levels of 50–80%. 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 Australian Hazel to prevent waterlogging, which leads to root rot and fungal issues.

Feed Australian Hazel 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 partial shade to full sun and well-draining acidic soil with high organic content. Avoid low spots where water collects after rain.

Australian Hazel 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.

Australian Hazel 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 Australian Hazel 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.

Australian Hazel 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.

Australian Hazel can be propagated through seeds, softwood cuttings. Similar propagation techniques also apply to white sourwood plant care, which shares the same genus.

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Australian Hazel 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.

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