Mountain pittosporum Plant Care

Mountain pittosporum (Pittosporum ralphii) belongs to the Pittosporaceae family within the Pittosporum genus. Mountain pittosporum is native to New Zealand. Mountain pittosporum is also known as Ralph's pittosporum.

Mountain pittosporum displays an upright, dense shrub growth habit, reaching up to 8 ft tall with a spread of approximately 6 ft. Mountain pittosporum produces small, fragrant, creamy white blooms in clusters.

Leaf size: approximately 4 inches.

Water a young or newly planted Mountain pittosporum 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.

Mountain pittosporum thrives in full sun to partial shade.

Pittosporum ralphii tolerates temperatures of 50–80°F. Mountain pittosporum prefers humidity levels of 40–70%.

Well-draining sandy loam with added organic matter for moisture retention. Good drainage is essential for Mountain pittosporum to prevent waterlogging, which leads to root rot and fungal issues.

Feed Mountain pittosporum 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 sandy loam with added organic matter for moisture retention. Avoid low spots where water collects after rain.

Mountain pittosporum is suited to USDA Zone 8a – 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.

Mountain pittosporum can spread to about 6 ft (1.8 m) and reach about 8 ft (2 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 Mountain pittosporum 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.

Mountain pittosporum is hardy down to USDA zone 8a, so once established it can stay outdoors through winter in that zone and warmer ones.

Water deeply in late autumn before the ground freezes, and spread a 5–8 cm (2–3 in) layer of mulch over the root zone, keeping it away from the trunk.

Young and container-grown trees need extra protection: roots in a pot freeze much more easily than roots in the ground.

Mountain pittosporum can be propagated through seeds, semi-hardwood cuttings. Similar propagation techniques also apply to pittosporum cornifolium plant care, which shares the same genus.

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

Mountain pittosporum is susceptible to aphids, scale insects, 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.

Mountain pittosporum grows outdoors in USDA Zone 8a – 10b. It survives winters down to planting zone 8a. Mountain pittosporum is native to New Zealand.