Tuberous Phebalium Plant Care

Tuberous Phebalium (Phebalium tuberculosum) belongs to the Rutaceae family within the Phebalium genus. Tuberous Phebalium is native to Western Australia.

Tuberous Phebalium displays a compact shrub, spreading growth habit, reaching up to 3 ft tall with a spread of approximately 4 ft. Tuberous Phebalium produces small, fragrant white or yellow flowers in clusters.

Leaf size: approximately 2 inches.

Water a young or newly planted Tuberous Phebalium every 7–14 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established shrubs mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Tuberous Phebalium thrives in full sun to partial shade.

Phebalium tuberculosum tolerates temperatures of 50–80°F. Tuberous Phebalium prefers humidity levels of 40–70%.

Well-draining acidic soil mix with added organic matter like peat moss or compost. Good drainage is essential for Tuberous Phebalium to prevent waterlogging, which leads to root rot and fungal issues.

Feed Tuberous Phebalium every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established shrubs 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 acidic soil mix with added organic matter like peat moss or compost. Avoid low spots where water collects after rain.

Tuberous Phebalium is suited to USDA Zone 12a.

Plant container-grown or balled-and-burlapped shrubs in spring or early autumn, setting the root flare at soil level, and water well after planting.

Tuberous Phebalium can spread to about 4 ft (1.2 m) and reach about 3 ft (1 m) tall. Space plants about 4 ft (1.2 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 plant spacing calculator.

Prune Tuberous Phebalium 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 shrub in one year.

Tuberous Phebalium is frost-tender (hardy to USDA zone 12). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Tuberous Phebalium can be propagated through softwood cuttings, seeds. Similar propagation techniques also apply to appressed phebalium plant care, which shares the same genus.

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

Tuberous Phebalium is susceptible to scale insects, aphids, 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.

Tuberous Phebalium grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Tuberous Phebalium is native to Western Australia. In cooler regions, grow Tuberous Phebalium as a houseplant or bring it indoors before the first frost.