Hardy orange Plant Care

Hardy orange (Triphasia brassii) belongs to the Rutaceae family within the Triphasia genus. Hardy orange is native to New Guinea. Hardy orange is also known as Triphasia trifolia 'Brassii'.

Hardy orange displays a compact, evergreen shrub growth habit, reaching up to 4 ft tall with a spread of approximately 4 ft. Hardy orange produces small white fragrant flowers with a citrus-like scent.

Leaf size: approximately 2 inches.

Water a young or newly planted Hardy orange every 7–10 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.

Hardy orange thrives in full sun to partial shade.

Triphasia brassii tolerates temperatures of 60–85°F. Hardy orange prefers humidity levels of 40–70%.

Well-draining, slightly acidic soil with added organic matter like compost. Good drainage is essential for Hardy orange to prevent waterlogging, which leads to root rot and fungal issues.

Feed Hardy orange 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, slightly acidic soil with added organic matter like compost. Avoid low spots where water collects after rain.

Hardy orange is suited to USDA Zone 13a.

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.

Hardy orange can spread to about 4 ft (1.2 m) and reach about 4 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 Hardy orange 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.

Hardy orange 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.

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

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Hardy orange is susceptible to citrus leafminer, citrus psyllid, 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.

Hardy orange grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Hardy orange is native to New Guinea. In cooler regions, grow Hardy orange as a houseplant or bring it indoors before the first frost.