Melicope saint-johnii Plant Care

Melicope saint-johnii (Melicope saint-johnii) belongs to the Rutaceae family within the Melicope genus. Melicope saint-johnii is native to the Hawaiian Islands.

Melicope saint-johnii displays a small tree or shrub growth habit, reaching up to 10 ft tall with a spread of approximately 8 ft. Melicope saint-johnii produces small, fragrant white flowers in clusters.

Leaf size: approximately 4 inches.

Water a young or newly planted Melicope saint-johnii 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.

Melicope saint-johnii thrives in full sun to partial shade.

Melicope saint-johnii tolerates temperatures of 60–85°F. Melicope saint-johnii prefers humidity levels of 50–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining, slightly acidic soil with added organic matter. Good drainage is essential for Melicope saint-johnii to prevent waterlogging, which leads to root rot and fungal issues.

Feed Melicope saint-johnii 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, slightly acidic soil with added organic matter. Avoid low spots where water collects after rain.

Melicope saint-johnii 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.

Melicope saint-johnii can spread to about 8 ft (2.4 m) and reach about 10 ft (3 m) tall. Space plants about 8 ft (2.4 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 Melicope saint-johnii 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.

Melicope saint-johnii 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.

Melicope saint-johnii can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to melicope accedens plant care, which shares the same genus.

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

Melicope saint-johnii is susceptible to citrus leafminer, scale insects, citrus psyllid. 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.

Melicope saint-johnii grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Melicope saint-johnii is native to the Hawaiian Islands. In cooler regions, grow Melicope saint-johnii as a houseplant or bring it indoors before the first frost.