Common walnut

Common Walnut

©Philip Precey

Common walnut

Scientific name: Juglas regia
The Common walnut tree produces a large, brown nut that is familiar to so many of us. It is an introduced species in the UK, and can be seen in towns, gardens and parks.

Species information


Height: up to 35m

Conservation status

Introduced species.

When to see

January to December


An introduced species, the Common walnut is a tall, deciduous tree, with a short trunk and wide crown. Widely planted in towns, gardens and parks, it produces a large, brown nut that is familiar to many of us, but which is actually housed within a green husk.

How to identify

The Common walnut is most easily recognised in summer and autumn when the large, round, green nuts appear. Its leaves are divided into seven to nine leaflets and smell like polish when crushed.



Did you know?

Common walnut was introduced to the UK by the Romans, who grew the tree for its edible nuts. It later became popular for its fine, decorative wood.

How people can help

Our gardens are a vital resource for wildlife, providing corridors of green space between open countryside, allowing species to move about. In fact, the UK's gardens provide more space for nature than all the National Nature Reserves put together. So why not try planting native plants and trees to entice birds, mammals and invertebrates into your backyard? To find out more about encouraging wildlife into your garden, visit our Wild About Gardens website: a joint initiative with the RHS, there's plenty of facts and tips to get you started.