Japanese Chestnut prefers consistently moist soil, especially during its establishment phase and dry periods. Water deeply and regularly, allowing the top few centimeters of soil to dry out slightly between waterings.

Reduce watering in winter when the tree is dormant to prevent root rot. Ensure good drainage to avoid waterlogged conditions.

Prune Japanese Chestnut in late winter or early spring while the tree is dormant. Remove dead, damaged, or crossing branches to improve air circulation and shape.

For fruiting trees, thin out crowded branches to encourage better fruit development and size. Avoid heavy pruning as it can stress the tree.

Japanese Chestnut is typically propagated by grafting onto suitable rootstock to ensure desired traits and disease resistance.

Seed propagation is possible but can result in offspring with variable characteristics, and seedlings may take many years to produce fruit. Stratification of seeds is usually required.

Repotting is generally not a common practice for mature Japanese Chestnut trees as they are large, long-lived woody plants. Young, container-grown specimens may benefit from repotting every 2-3 years into a slightly larger container with well-draining potting mix to accommodate root growth.