Oleaster Plant Care

Oleaster (Denhamia oleaster) belongs to the Celastraceae family within the Denhamia genus. Oleaster is native to Queensland.

Oleaster displays a compact, bushy shrub growth habit, reaching up to 2.5 ft tall with a spread of approximately 2.5 ft. Oleaster produces small, fragrant white flowers in clusters.

Leaf size: approximately 4 inches.

Water a young or newly planted Oleaster 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.

Oleaster thrives in bright indirect light. Avoid placing Oleaster in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Denhamia oleaster tolerates temperatures of 60–75°F. Oleaster prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

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

Feed Oleaster 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 bright indirect light and well-draining, slightly acidic soil with added organic matter like compost. Avoid low spots where water collects after rain.

Oleaster 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.

Oleaster can spread to about 3 ft (0.8 m) and reach about 3 ft (1 m) tall. Space plants about 3 ft (0.8 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 plant spacing calculator.

Prune Oleaster 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.

Oleaster 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.

Oleaster can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to bushy denhamia plant care, which shares the same genus.

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

Oleaster 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.

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