Cooktown Ironwood Plant Care

Cooktown Ironwood (Erythrophleum chlorostachys) belongs to the Fabaceae family within the Erythrophleum genus. Cooktown Ironwood is native to northern Australia. Cooktown Ironwood is also known as Ironwood.

Cooktown Ironwood displays a tall tree, spreading canopy growth habit, reaching up to 30 ft tall with a spread of approximately 20 ft. Cooktown Ironwood produces small yellow flowers in clusters.

Leaf size: approximately 6 inches.

Water a young or newly planted Cooktown Ironwood 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.

Cooktown Ironwood thrives in full sun.

Erythrophleum chlorostachys tolerates temperatures of 65–85°F. Cooktown Ironwood prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining loamy soil with added sand and perlite for improved drainage. Good drainage is essential for Cooktown Ironwood to prevent waterlogging, which leads to root rot and fungal issues.

Feed Cooktown Ironwood 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 and well-draining loamy soil with added sand and perlite for improved drainage. Avoid low spots where water collects after rain.

Cooktown Ironwood 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.

Cooktown Ironwood 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 Cooktown Ironwood 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.

Cooktown Ironwood 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.

Cooktown Ironwood can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to ordeal tree plant care, which shares the same genus.

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

Cooktown Ironwood is susceptible to spider mites, scale insects, caterpillars. 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.

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