Silk Tree Plant Care

Silk Tree (Albizia julibrissin) belongs to the Fabaceae family within the Albizia genus. Silk Tree is native to southwestern and eastern Asia. Silk Tree is also known as Mimosa, Persian Silk Tree, Pink Siris.

Silk Tree displays a fast-growing tree growth habit, reaching up to 30 ft tall with a spread of approximately 20 ft. Silk Tree produces showy clusters of fragrant pink or white flowers.

Leaf size: approximately 6 inches.

Water a young or newly planted Silk 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.

Silk Tree thrives in full sun to partial shade.

Albizia julibrissin tolerates temperatures of 60–85°F. Silk Tree prefers humidity levels of 40–70%.

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

Feed Silk Tree 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.

Silk Tree is suited to USDA Zone 6a – 9b.

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.

Silk 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 Silk 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.

Silk Tree is hardy down to USDA zone 6a, so once established it can stay outdoors through winter in that zone and warmer ones.

Water deeply in late autumn before the ground freezes, and spread a 5–8 cm (2–3 in) layer of mulch over the root zone, keeping it away from the trunk.

Young and container-grown trees need extra protection: roots in a pot freeze much more easily than roots in the ground.

Silk Tree can be propagated through seeds, softwood cuttings.

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

Silk Tree is susceptible to aphids, caterpillars, scale insects. 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.

Silk Tree grows outdoors in USDA Zone 6a – 9b. It survives winters down to planting zone 6a. Silk Tree is native to southwestern and eastern Asia.