Juglans mandshurica aka Manchurian Walnut

Juglans mandshurica is a tree in the walnut family, Juglandaceae. Its common names include Manchurian walnut and Chinese walnut. Gardeners also call it Chinese butternut. Kew’s supplied record lists Japan as its native range. It places the tree in a temperate climate. The RHS says it is not native to Britain or Ireland. Other names listed for it include Juglans cathayensis and Juglans mandschurica. These synonyms can help you check old plant records. They can also help when you read nursery labels.

The Chicago Botanic Garden calls the tree’s form horizontal. This means it spreads out rather than forming a narrow shape. The garden lists it as a shade tree. Its shape thus plays a key part in its landscape use. The sources give no height or crown width at full size. They give no growth rate or time to reach full size. These gaps make its future space needs hard to judge. The RHS says the walnut genus sheds its leaves. It has pinnate leaves, with leaflets along a central stalk. That account gives no bark or stem details for this species.

Chicago lists green flowers in May and June. The RHS says walnut flowers are small and grow in catkins. Its page for this species says the tree bears walnuts. The supplied account gives no fruit size or harvest season. It gives no close details of the shells or kernels. The RHS says nuts in the genus are usually fit to eat. This broad claim does not confirm food use for this species. The evidence does not settle whether it is safe for people. It does not settle pet safety either.

For growing, Chicago lists full sun and USDA zones 3–7. The care record gives a moderate need for water. No source states a preferred soil texture or pH. None gives clear guidance on drainage or how it copes with drought. The evidence backs a sunny site, but no detailed soil choice. It gives no basis for a UK hardiness rating.

The recorded garden use pairs shade with a spreading shape. The sources name no pests or diseases for this species. They give no pruning method or schedule for other routine care. Chicago marks its profile as an archive from before February 2022. Its bloom and hardiness details thus come from an older garden record.