Juglans ailantifolia – Japanese walnut

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Juglandaceae

Juglans ailantifolia – Japanese walnut

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Large park tree with broad, round crown, up to 20 m tall and broad. The first-year twigs are densely covered with glandular hairs, but have hardly any hairs in their second year. The large, imparipinnate leaves are 40 - 60 cm long and up to 90 cm long in young, vigorously growing trees. They consist of 11 to 17 dark green leaf segments and the leaf margins have shallow serrations. The male flower catkins can be 25 cm long. The flowers appear in May, soon after the leaves emerge. The fruits hang in clusters of up to 20. The husks carry sticky hairs. The nut has a short, pointed tip and a fairly thick membrane where the two halves meet. Grows on almost any soil, as long as fertile. Does need space to develop a good, regular crown.

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Specifications
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Height
15 - 20 m
Width
15-20
Crown
round, half-open crown
Bark and branches
young twigs brown-green, bark light grey with reticulate grooves
Leaf
imparipinnate, 40 - 50 (60) cm, with 11 - 17 leaf segments, elongated to elliptical, 10 - 16 cm, dark green, feathered leaf
Flowers
♀ red flowers in racemes and 10 - 20 cm, ♂ green catkins, 10 - 25 cm, May
Fruits
round to somewhat ovoid, about 3 cm, in clusters of up to 20
Spines/thorns
None
Toxicity
usually not toxic to people, (large) pets and livestock
Soil type
any, if fertile
Paving
tolerates no paving
Winter hardiness zone
5b (-26,0 to -23,4 °C)
Wind resistance
good
Other resistances
resistant to frost (WH 1 - 6), can withstand wind
Shape
clearstem tree, multi-stem treem
Origin
Japan, Sakhalin
Synonyms
Juglans sieboldiana
Clear stem tree Multi-stem tree calcareous soil clay soil loamy soil sandy soil tolerates no paving resistant to frost (WH 1 - 6) can withstand wind 1st size , taller than 12 metres half-open crown green green orange/red late sprout average growing Feathered leaf non-toxic (usually) Ornamental fruit
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Frequently asked questions
Juglans ailantifolia

Juglans ailantifolia can eventually reach a height of 15 - 20 m, depending on the site and climate conditions.

Juglans ailantifolia is average growing and can eventually reach a height of 15 - 20 m, depending on the site and climate conditions.

The right time to plant Juglans ailantifolia is during the dormancy period. In Western Europe, Juglans ailantifolia with root balls can generally be planted from mid-November to late April, although this depends strongly on the climatic conditions and the species of tree.

Juglans ailantifolia blooms in may.
General

Yes, we deliver to the UK. Delivery costs depend on the region and the total order value. Below, you’ll find all the details.

Delivery charges for private customers are calculated based on your region and are visible during the checkout process. We also offer discounts based on the total value of your order:

  • Orders over £1,000: Receive a 50% discount on delivery costs.
  • Orders over £2,000: Delivery is completely free.

Yes, for trees with a size of 50-60 cm girth or larger, additional delivery charges apply due to the need for specialised transport. These costs will be calculated separately and shared with you after your order is placed. We will contact you to discuss the transport options and costs.

Once you add items to your basket and proceed to the checkout, the system will calculate the delivery charges for your region. If your order qualifies for any discounts, they will automatically be applied.

For any questions or specific delivery requests, feel free to contact our customer service team. We’re happy to help arrange the best delivery solution for your order.