Japanese hornbeam

Carpinus japonica

In other languages: Japanse haagbeuk (Nederlands) · Charme du Japon (Français)

Japanese hornbeam comes from Japan, where it grows in mountain forests. It is a small, wide-spreading tree with layered, almost horizontal branches, so it often becomes as wide as it is tall. The leaves are narrowly oval with many clearly impressed side veins, which gives them a pleated look. Catkins hang in spring, followed in summer and autumn by graceful, hop-like fruiting catkins. The autumn colour is yellow to brown. It grows slowly, takes pruning well and suits a smaller garden.

Updated on 9 October 2026

Light
Sun or partial shade
preferably some sun
Moisture
Normal
no wet feet
Legal basis
Sand, loam or clay
any pH
Hardiness
Fully hardy
down to -25 °C
Size
8 m
tall, 8 m wide
Flowering
April–May

Key facts
Pruning months	February and August
Height	8 m
Native to Belgium	No, planted
Poisonous to people and pets	Not known to be poisonous
Flowering	April–May

Identify

Japanese hornbeam: how do you recognise it?

Habit: Small tree or large shrub with a broad, layered crown; about 8 m tall and 8 m wide, slow-growing.
Leaves: Narrowly oval, 5–10 cm, doubly toothed with many deeply impressed side veins; dark green, yellow to brown in autumn.
Flowers: Catkins in April–May, male and female on the same tree; not showy.
Fruit: Hanging fruiting catkins made of overlapping, leafy bracts that resemble hops.
Trunk: Grey-brown and fairly smooth; old trunks become lightly furrowed.

Flowering: April–May · Plants: March–April and October–December · Pruning: February and August

In your garden

Why grow it?

Strongly pleated, graceful foliage with a fine texture.
Hop-like fruiting catkins that catch the eye in summer and autumn.
Broad, layered crown with an almost horizontal branch structure.
Stays small (about 8 m) and fits smaller gardens.
Tolerates pruning, as a trained specimen or a dense hedge.

Japanese hornbeam: where does it grow best?

Sun or partial shade; it grows best in a bright spot.
Ordinary, moisture-retentive soil: sand, loam or clay, acid to chalky.
Ordinary soil; not permanently wet, but not bone dry either.
Plant 4–6 m from buildings or other trees and allow for a crown up to 8 m wide.

Light: Sun and partial shade
Soil type: Sand, loam or clay
Acidity: Not fussy
Moisture: Normal
Size: 8 m tall, 8 m wide
Hardiness: Hardy (to -25 °C)

Goes well with

Hydrangea: Flowers in summer beneath the light crown.
Hosta: Large leaves for a partial-shade edge.
Ferns: A fresh underplanting that tolerates shade.
Japanese maple: A fitting Asian companion with colourful foliage.

Maintenance

Japanese hornbeam: when and how to plant it?

Plant in March–April and October–December.

Plant in March–April or from October to December, when the soil is neither frozen nor waterlogged.
Dig a hole twice as wide as the root ball and just as deep.
Set the tree at the same depth as in its pot or at the nursery and backfill with the soil you dug out, mixed with a little compost.
Add a stake and tie the trunk loosely with a tree tie.
Water generously straight away and spread a 5–8 cm layer of wood chips or leaf mould around the base.

Care

Water: In the first two summers, water thoroughly every week in dry spells. After that it usually looks after itself, except in long dry periods.
Feeding: Usually unnecessary. A layer of compost in spring is enough.
Mulching: A mulch keeps the soil cool and moist and suppresses weeds.
Staking: Tie a young tree to a stake for 2–3 years and check the tie every year.
Training: In the first years, keep a single leader and let the side branches spread out horizontally.

Tip: Give it room to spread its layered branches widely and prune only lightly: its natural, wide shape is the most beautiful.

Japanese hornbeam: when to prune it?

Pruning months: February and August.

When: Structural pruning in winter, in February; light shaping in late August.

How:

Remove dead, damaged and crossing branches.
Cut small branches just outside the branch collar, never flush with the trunk.
For a more compact shape, lightly shorten the tips of the new shoots each year.
It also tolerates hard formative pruning and can be clipped as a hedge or into a shape.

Pruning: when and how · Pruning calendar and basic rules

Propagation

Seed: Sow the seed outdoors in autumn in a tray of light, moist soil, or after cold stratification in spring. The seed may lie dormant for a year before germinating.
Nursery: Seedlings grow slowly. For a handsome tree quickly, buy a young tree from a nursery.

Japanese hornbeam: how does it get through the winter?

Hardy to −25 °C.

Hardy to about −25 °C: usually no protection needed in Belgium.
In winter the layered branch structure shows well, especially with frost on it.
In a hard winter, give young trees an extra layer of mulch around the base.

Diseases and pests

Scorched leaf edges: Brown edges in drought or strong wind. Water generously, apply a mulch and choose a sheltered spot.
Powdery mildew: White powder on the leaves, mostly at the end of summer. Usually harmless; choose an airy position.
Aphids: Sticky leaves in summer. Ladybirds and tits usually clear them up.
Wet feet: Yellowing leaves and poor growth on heavy, wet soil. Plant in well-drained soil.

Through the year

February: Structural pruning. Remove dead branches.
March: Plant. Apply mulch.
April: Catkins open. Planting still possible.
May: Leaves fully out. Water in dry weather.
June: Water young trees in dry weather.
July: Water during prolonged drought.
August: Light shaping in late August.
September: The hop-like fruits ripen.
October: Yellow to brown autumn colour. Plant.
November: Plant. Leave the leaves as mulch.
December: Rest. Plant while the soil is open.

You and this species

Did you know?

The fruiting catkins look like hops, but have nothing to do with the hop plant.
In Japan the tree is also used for bonsai.
It belongs to the birch family, like our native hornbeam.

Garden plants · All species