Plum-fruited Poison Berry Plant Care

Plum-fruited Poison Berry (Strychnos psilosperma) belongs to the Loganiaceae family within the Strychnos genus. Plum-fruited Poison Berry is native to New South Wales and Queensland in Australia. Plum-fruited Poison Berry is also known as Green Plum.

Plum-fruited Poison Berry displays a small tree or shrub growth habit, reaching up to 10 ft tall with a spread of approximately 8 ft. Plum-fruited Poison Berry produces small, fragrant white flowers.

Leaf size: approximately 4 inches.

Water a young or newly planted Plum-fruited Poison Berry 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.

Plum-fruited Poison Berry thrives in full sun to partial shade.

Strychnos psilosperma tolerates temperatures of 65–85°F. Plum-fruited Poison Berry prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining sandy loam with added organic matter. Good drainage is essential for Plum-fruited Poison Berry to prevent waterlogging, which leads to root rot and fungal issues.

Feed Plum-fruited Poison Berry 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. Avoid low spots where water collects after rain.

Plum-fruited Poison Berry is suited to USDA Zone 13b.

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.

Plum-fruited Poison Berry 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 Plum-fruited Poison Berry 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.

Plum-fruited Poison Berry 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.

Plum-fruited Poison Berry can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to icaco plant care, which shares the same genus.

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

Plum-fruited Poison Berry 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.

Plum-fruited Poison Berry grows outdoors in USDA Zone 13b. It survives winters down to planting zone 13b. Plum-fruited Poison Berry is native to New South Wales and Queensland in Australia. In cooler regions, grow Plum-fruited Poison Berry as a houseplant or bring it indoors before the first frost.