Juglans ailantifolia, commonly known as the Japanese walnut or the Heartnut, is a deciduous tree in the walnut family Juglandaceae. It is native to Japan, China, and Korea, but is widely cultivated in many parts of the world.
The tree can grow up to 20-30 meters tall and has a broad, spreading crown. The bark is grayish-brown and deeply furrowed. The leaves are pinnately compound, with 13-25 leaflets, and are about 30-60 cm long.
The fruit of the Japanese walnut is a round or oblong nut, enclosed in a hard, thick, green husk that splits open when ripe. The nut itself is edible, with a sweet and nutty flavor, and is often used in baking and cooking.
The Heartnut is prized for its attractive heart-shaped nuts and ornamental value, and is often grown in gardens and parks. It is also cultivated for its wood, which is used in furniture-making, cabinetry, and flooring.
Juglans ailantifolia is generally a hardy tree that can tolerate a range of soil types and growing conditions. It prefers well-drained soils and full sun, and can be propagated from seeds or grafting. However, it is susceptible to some diseases, such as bacterial blight and anthracnose, and pests such as walnut husk fly and walnut weevil.