False Thorn Plant Care

False Thorn (Umtiza listeriana) belongs to the Fabaceae family within the Umtiza genus. False Thorn is native to a small coastal portion of the Eastern Cape in South Africa.

False Thorn displays a tall, spreading tree growth habit, reaching up to 30 ft tall with a spread of approximately 20 ft. False Thorn produces small, fragrant white flowers in clusters.

Leaf size: approximately 6 inches.

Water a young or newly planted False Thorn 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.

False Thorn thrives in full sun to partial shade.

Umtiza listeriana tolerates temperatures of 60–85°F. False Thorn prefers humidity levels of 40–70%.

Well-draining loamy soil with added compost for nutrients. Good drainage is essential for False Thorn to prevent waterlogging, which leads to root rot and fungal issues.

Feed False Thorn 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 loamy soil with added compost for nutrients. Avoid low spots where water collects after rain.

False Thorn 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.

False Thorn can spread to about 20 ft (6.1 m) and reach about 30 ft (9 m) tall. Space plants about 20 ft (6.1 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 False Thorn 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.

False Thorn 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.

False Thorn can be propagated through seeds, stem cuttings.

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False Thorn is susceptible to aphids, caterpillars, leaf miners. 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.

False Thorn grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. False Thorn is native to a small coastal portion of the Eastern Cape in South Africa. In cooler regions, grow False Thorn as a houseplant or bring it indoors before the first frost.