Green Walnut Plant Care

Green Walnut (Endiandra virens) belongs to the Lauraceae family within the Endiandra genus. Green Walnut is also known as Black Walnut, Walnut.

Green Walnut displays a tall, upright tree growth habit, reaching up to 30 ft tall with a spread of approximately 15 ft. Green Walnut produces small, inconspicuous flowers.

Leaf size: approximately 6 inches.

Water a young or newly planted Green Walnut 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.

Green Walnut thrives in partial to full shade. The optimal light range is 100–500 lux. Avoid placing Green Walnut in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Endiandra virens tolerates temperatures of 60–80°F. Green Walnut prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Rich, well-draining soil with high organic content. Good drainage is essential for Green Walnut to prevent waterlogging, which leads to root rot and fungal issues.

Feed Green Walnut 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 to full shade and rich, well-draining soil with high organic content. Avoid low spots where water collects after rain.

Green Walnut is suited to USDA Zone 13a.

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.

Green Walnut 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 Green Walnut 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.

Green Walnut 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.

Green Walnut can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to brush ironwood plant care, which shares the same genus.

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Green Walnut is susceptible to 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.

Green Walnut grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. In cooler regions, grow Green Walnut as a houseplant or bring it indoors before the first frost.