Japanese Elm Plant Care

Japanese Elm (Ulmus davidiana var. japonica) belongs to the Ulmaceae family within the Ulmus genus. Japanese Elm is native to much of continental northeast Asia and Japan. Japanese Elm is also known as Honduras Elm.

Japanese Elm displays a tall, deciduous tree growth habit, reaching up to 80 ft tall with a spread of approximately 60 ft. Japanese Elm produces inconspicuous small flowers.

Leaf size: approximately 4 inches.

Water a young or newly planted Japanese Elm 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.

Japanese Elm thrives in full sun to partial shade.

Ulmus davidiana var. japonica tolerates temperatures of 20–90°F. Japanese Elm prefers humidity levels of 40–70%.

Well-draining loamy soil with good organic content. Good drainage is essential for Japanese Elm to prevent waterlogging, which leads to root rot and fungal issues.

Feed Japanese Elm 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 to partial shade and well-draining loamy soil with good organic content. Avoid low spots where water collects after rain.

Japanese Elm is suited to USDA Zone 4a – 7b.

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.

Japanese Elm can spread to about 60 ft (18.3 m) and reach about 80 ft (24 m) tall. Space plants about 60 ft (18.3 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 Japanese Elm 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.

Japanese Elm is hardy down to USDA zone 4a, 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.

Japanese Elm can be propagated through seeds, hardwood cuttings. Similar propagation techniques also apply to american elm plant care, which shares the same genus.

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

Japanese Elm is susceptible to elm leaf beetles, aphids, caterpillars. 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.

Japanese Elm grows outdoors in USDA Zone 4a – 7b. It survives winters down to planting zone 4a. Japanese Elm is native to much of continental northeast Asia and Japan.