Japanese walnut (Juglans ailanthifolia)

Japanese walnut

The leaves are pinnate, 50 to 90 cm long, with 11-17 leaflets, each leaflet 7 to 16 cm long and 3 to 5 cm broad. The male flowers are inconspicuous yellow-green catkins produced in spring at the same time as the new leaves appear. The fruit is a nut, produced in bunches of 4-10 together; the nut is spherical, 3 to 5 cm long and broad, surrounded by a green husk before maturity in mid autumn.

Scientific classification

Species

Japanese walnut (Juglans ailanthifolia)

Beeches, walnuts, and allied trees

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Perennial

Lifespan

Deciduous

Leaf type

0 - 32 ℃

Ideal Temperature

Images of Japanese walnut

Distribution of Japanese walnut

Distribution Map

Japanese walnut is native to regions of Eastern Asia, where it flourishes in temperate climates. It has been introduced to various other temperate areas across continents including Europe, the Caucasus, and Oceania. In these regions, it has become part of the local flora, adapting to similar environmental conditions as those found in its native range.

Native

Cultivated

Invasive

Introduced

No species reported

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Care Guide for Japanese walnut

Twice per week

Water

Full sun

Sunlight

0 - 32 ℃

Ideal Temperature

Water: Japanese walnut thrives in moist conditions and prefers stable soil hydration for optimal growth. It should be watered twice a week and benefits from natural rainfall patterns, especially when grown outdoors, promoting vigorous growth during its active season.

Fertilize: Ground-grown japanese walnut requires no additional fertilizer, while container-grown japanese walnut benefits from a slow-release fertilizer applied each spring, unless it has been repotted recently.

Pruning: Japanese walnut features compound leaves and edible nuts, thriving with annual pruning in early spring. Key practices include removing dead or overcrowded branches to boost airflow and sunlight, while avoiding excessive cuts to prevent sap loss. These methods enhance health and nut yield, as per horticultural guidelines.

Propagation: Japanese walnut can be propagated successfully through the cutting method using semi-hardwood cuttings. A clean cut, rooting hormone, well-draining soil, and consistent moisture and warmth are essential for root development and new growth establishment.

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