Australian Water-Elder Plant Care

Australian Water-Elder (Debregeasia australis) belongs to the Urticaceae family within the Debregeasia genus. Australian Water-Elder is native to Queensland, Australia. Australian Water-Elder is also known as Karamu.

Australian Water-Elder displays a shrubby, upright habit growth habit, reaching up to 6 ft tall with a spread of approximately 4 ft. Australian Water-Elder produces inconspicuous flowers in clusters.

Leaf size: approximately 8 inches.

Water a young or newly planted Australian Water-Elder 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.

Australian Water-Elder thrives in bright indirect light. Avoid placing Australian Water-Elder in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Debregeasia australis tolerates temperatures of 65–80°F. Australian Water-Elder prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining loamy soil with added organic matter like compost or peat moss. Good drainage is essential for Australian Water-Elder to prevent waterlogging, which leads to root rot and fungal issues.

Feed Australian Water-Elder 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 loamy soil with added organic matter like compost or peat moss. Avoid low spots where water collects after rain.

Australian Water-Elder 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.

Australian Water-Elder 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 Water-Elder 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 Water-Elder 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.

Australian Water-Elder can be propagated through stem cuttings, division of root suckers. Similar propagation techniques also apply to himalayan mulberry plant care, which shares the same genus.

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

Australian Water-Elder is susceptible to aphids, 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 Water-Elder grows outdoors in USDA Zone 13b. It survives winters down to planting zone 13b. Australian Water-Elder is native to Queensland, Australia. In cooler regions, grow Australian Water-Elder as a houseplant or bring it indoors before the first frost.