Juglans ailantifolia

Japanese Walnut

  • Juglans ailantifolia

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Min. hardiness zone:
Inventory ID:

No Export to These Countries

Australia, Japan

Growing Info

Scarification: Soak in water, let stand in water for 24 hours
Stratification: cold stratify for 120 days
Germination: sow 1-2 deep, tamp the soil, keep moist, mulch the seed bed, remove mulch upon germination

Other: Should be cleaned prior to treatment or sowing. 

The Japanese Walnut, also known as Juglans ailantifolia, is a beautiful and unique tree that is native to Japan and Sakhalin. It is a deciduous tree with a mature height of 20-30 meters and a stem diameter of 40-80 centimeters. The light grey bark adds to its visual appeal.

One of the standout features of the Japanese Walnut is its bold and decorative leaves. They are pinnate, measuring 50-90 centimeters in length, and are made up of 11-17 leaflets. Each leaflet is 7-16 centimeters long and 3-5 centimeters broad. The whole leaf is downy-pubescent, giving it a striking, brighter green color compared to other tree leaves.

In the spring, the tree produces inconspicuous yellow-green catkins that add to its overall charm. At the same time, new leaves emerge, creating a lovely combination of colors. Meanwhile, the fruit of the tree is a nut that grows in bunches of 4-10 together. Before reaching maturity in mid-autumn, the nuts are surrounded by a green husk.

The Japanese Walnut is not only appreciated for its aesthetics but also for its versatility. It serves as an excellent ornamental tree for parks and large gardens due to its attractive appearance. Additionally, the tree is relatively hardy, with a tolerance for various soil types, including light (sandy), medium (loamy), and heavy (clay) soils. It prefers well-drained soil and can tolerate different pH levels ranging from acidic to alkaline. However, it requires moist soil and cannot grow in the shade.

With its unique characteristics and adaptability, the Japanese Walnut is a desirable addition to any landscape. Whether you are looking for an eye-catching tree or a productive nut producer, the Japanese Walnut will not disappoint. To learn more about this tree and its specifications, please visit our website at http://plants.usda.gov.

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