Kamahi Plant Care

Kamahi (Weinmannia racemosa) belongs to the Cunoniaceae family within the Weinmannia genus. Kamahi is native to New Zealand.

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

Leaf size: approximately 6 inches.

Water a young or newly planted Kamahi 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.

Kamahi thrives in partial to full sun.

Weinmannia racemosa tolerates temperatures of 60–80°F. Kamahi 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 Kamahi to prevent waterlogging, which leads to root rot and fungal issues.

Feed Kamahi every 8 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 sun and rich, well-draining soil with high organic content. Avoid low spots where water collects after rain.

Kamahi is suited to USDA Zone 9a – 10b.

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.

Kamahi 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 Kamahi 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.

Kamahi is frost-tender (hardy to USDA zone 9). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Kamahi can be propagated through seeds, cuttings. Similar propagation techniques also apply to apurimac shrub plant care, which shares the same genus.

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

Kamahi is susceptible to aphids, scale insects. 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.

Kamahi grows outdoors in USDA Zone 9a – 10b. It survives winters down to planting zone 9a. Kamahi is native to New Zealand. In cooler regions, grow Kamahi as a houseplant or bring it indoors before the first frost.