Krauss's Thorn Tree Plant Care

Krauss's Thorn Tree (Vachellia nilotica subsp. kraussiana) belongs to the Fabaceae family within the Vachellia genus. Krauss's Thorn Tree is native to Africa. Krauss's Thorn Tree is also known as Sweet Thorn.

Krauss's Thorn Tree displays a fast-growing tree growth habit, reaching up to 30 ft tall with a spread of approximately 20 ft. Krauss's Thorn Tree produces small, fluffy, pale yellow to cream-colored flowers in spherical clusters.

Leaf size: approximately 6 inches.

Water a young or newly planted Krauss's Thorn Tree 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.

Krauss's Thorn Tree thrives in full sun.

Vachellia nilotica subsp. kraussiana tolerates temperatures of 60–85°F. Krauss's Thorn Tree prefers humidity levels of 40–70%.

Well-draining sandy loam with added organic matter for moisture retention. Good drainage is essential for Krauss's Thorn Tree to prevent waterlogging, which leads to root rot and fungal issues.

Feed Krauss's Thorn Tree every 8 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 and well-draining sandy loam with added organic matter for moisture retention. Avoid low spots where water collects after rain.

Krauss's Thorn Tree is suited to USDA Zone 10a – 12b.

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.

Krauss's Thorn Tree 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 Krauss's Thorn Tree 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.

Krauss's Thorn Tree is frost-tender (hardy to USDA zone 10). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Krauss's Thorn Tree can be propagated through seeds, root cuttings. Similar propagation techniques also apply to bullhorn acacia plant care, which shares the same genus.

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

Krauss's Thorn Tree is susceptible to aphids, spider mites, thrips. 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.

Krauss's Thorn Tree grows outdoors in USDA Zone 10a – 12b. It survives winters down to planting zone 10a. Krauss's Thorn Tree is native to Africa. In cooler regions, grow Krauss's Thorn Tree as a houseplant or bring it indoors before the first frost.