Pinnate Yellowwood Plant Care

Pinnate Yellowwood (Zanthoxylum pinnatum) belongs to the Rutaceae family within the Zanthoxylum genus. Pinnate Yellowwood is native to Lord Howe and Norfolk Islands.

Pinnate Yellowwood displays an upright, small tree growth habit, reaching up to 10 ft tall with a spread of approximately 6 ft. Pinnate Yellowwood produces small clusters of white or greenish flowers.

Leaf size: approximately 4 inches.

Water a young or newly planted Pinnate Yellowwood 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.

Pinnate Yellowwood thrives in full sun to partial shade.

Zanthoxylum pinnatum tolerates temperatures of 60–85°F. Pinnate Yellowwood prefers humidity levels of 40–70%.

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

Feed Pinnate Yellowwood 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 to partial shade and well-draining loamy soil with added sand and perlite for improved drainage. Avoid low spots where water collects after rain.

Pinnate Yellowwood 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.

Pinnate Yellowwood can spread to about 6 ft (1.8 m) and reach about 10 ft (3 m) tall. Space plants about 6 ft (1.8 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 Pinnate Yellowwood 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.

Pinnate Yellowwood 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.

Pinnate Yellowwood can be propagated through seeds, stem cuttings.

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

Pinnate Yellowwood is susceptible to aphids, scale insects, citrus leaf miners. 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.

Pinnate Yellowwood grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Pinnate Yellowwood is native to Lord Howe and Norfolk Islands. In cooler regions, grow Pinnate Yellowwood as a houseplant or bring it indoors before the first frost.