Black walnut
Black walnut (*Juglans nigra*) is a tall deciduous tree in the walnut family native to eastern North America.
Black walnut (Juglans nigra) is a tall deciduous tree in the walnut family native to eastern North America. It is valued for its dark, fine-grained wood and edible nuts, and it is also planted as an ornamental and used as a source of dye from its fruit husks. The tree produces juglone, a chemical that can inhibit growth of some nearby plants.
Description
Black walnut is a large deciduous tree with compound leaves, dark bark, and a rounded crown. It can grow to substantial height and is often recognized by its green husked fruits and deeply furrowed trunk bark.
Distribution and habitat
The species is native to eastern and central North America and is associated with rich, moist soils, especially in floodplains, bottomlands, and fertile slopes. It is widely planted outside its native range as a landscape tree.
Uses
Black walnut is one of the most valuable hardwood trees in North America because of its dark, stable wood, which is used for furniture, veneers, and gunstocks. The nuts are edible and sold commercially, and the fruit husks have also been used for dye.
Ecology
Black walnut produces juglone, a natural chemical in leaves, roots, bark, and husks that can affect nearby plants. This trait makes it ecologically distinctive and can limit what grows close to the tree.
Key facts
- Black walnut is native to eastern North America and grows across a broad swath of the central and eastern United States.
- Its wood is highly prized for furniture, paneling, veneers, and gunstocks.
- The tree produces edible nuts, though the nuts are difficult to harvest and have limited commercial importance compared with the wood.
- Black walnut fruit husks have been used to make dye.
- The tree contains juglone, which can suppress the growth of some other plants nearby.
Black walnut is grown and studied in parts of southern Canada as an ornamental and in arboretums, and Canadian readers may also encounter it in horticulture, forestry collections, and planted landscapes near the U.S. border.
Frequently asked questions
What is black walnut?
Why is black walnut important?
Where does black walnut grow naturally?
What is black walnut wood used for?
Does black walnut affect nearby plants?
Are black walnut nuts edible?
References
- Encyclopaedia Britannica — https://www.britannica.com/plant/black-walnutSupports: Species identification, native range, wood uses, and ornamental cultivation.
- NC State Extension Plant Toolbox — https://plants.ces.ncsu.edu/plants/juglans-nigra/Supports: Scientific name, family, native range, and general plant description.
- Minnesota Wildflowers — https://www.minnesotawildflowers.info/tree/black-walnutSupports: Typical height, native range, habitat, and uses.
- Native Plant Trust Go Botany — https://gobotany.nativeplanttrust.org/species/juglans/nigra/Supports: Wood value, ecological history, and juglone-related effects.
- U.S. National Park Service — https://www.nps.gov/articles/000/cny-treephenology-blackwalnut.htmSupports: Leaf, bark, fruit, and overall tree characteristics.
- Minnesota Department of Natural Resources — https://www.dnr.state.mn.us/trees/black-walnut.htmlSupports: Wood properties, uses, and growth characteristics.