Formosan Crab Apple Plant Care

Formosan Crab Apple (Malus doumeri) belongs to the Rosaceae family within the Malus genus. Formosan Crab Apple is native to temperate and tropical Asia.

Formosan Crab Apple displays a small to medium-sized deciduous tree growth habit, reaching up to 25 ft tall with a spread of approximately 20 ft. Formosan Crab Apple produces showy white, pink, or red blossoms.

Leaf size: approximately 4 inches.

Water a young or newly planted Formosan Crab Apple every 7–10 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.

Formosan Crab Apple thrives in full sun.

Malus doumeri tolerates temperatures of 40–90°F. Formosan Crab Apple prefers humidity levels of 40–70%.

Well-draining loamy soil with good fertility. Good drainage is essential for Formosan Crab Apple to prevent waterlogging, which leads to root rot and fungal issues.

Feed Formosan Crab Apple 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 and well-draining loamy soil with good fertility. Avoid low spots where water collects after rain.

Formosan Crab Apple is suited to USDA Zone 8a – 10b.

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.

Formosan Crab Apple can spread to about 20 ft (6.1 m) and reach about 25 ft (8 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 Formosan Crab Apple 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.

Formosan Crab Apple is hardy down to USDA zone 8a, 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.

Formosan Crab Apple can be propagated through seeds, grafting, cuttings. Similar propagation techniques also apply to sweet crabapple plant care, which shares the same genus.

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

Formosan Crab Apple is susceptible to aphids, codling moths, 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.

Formosan Crab Apple grows outdoors in USDA Zone 8a – 10b. It survives winters down to planting zone 8a. Formosan Crab Apple is native to temperate and tropical Asia.