eastern black walnut
Juglans nigra
A large deciduous tree native to eastern North America, valued for its dark wood and edible nuts, though it produces allelopathic compounds that inhibit nearby plants. It develops a broad, spreading canopy and displays attractive golden fall foliage.
Overview
- Form
- Growth Rate
- Size
- Dormancy
Tolerances & Soil
Drought Tolerance
USDA Hardiness Zone
pH Range
Soil Texture
Seasonality
Bloom Season
Harvest Season
Season of Interest
Forest Layer Placement
Canopy
The tallest trees that form the overstory.
Succession Role
Native to the United States
Native Range
Eastern North America
Native to: Alabama, Arkansas, Connecticut, Delaware, Georgia, Illinois, Indiana, Iowa, Kentucky, Louisiana, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Tennessee, Vermont, Virginia, West Virginia, Wisconsin
Function & Care
Functional Roles
Edible Parts
Establishment & Care
- Establishment
- Maintenance
- Years to Bearing
- Propagation
Companion Planting
Avoid near
3
Solanum lycopersicum
Juglans nigra exudes juglone (5-hydroxy-1,4-naphthoquinone), an allelopathic compound that causes wilt and death in solanaceous plants including tomato within a 50-80 ft radius.
Capsicum annuum
Juglone from black walnut roots and fallen foliage inhibits the growth of peppers and other sensitive solanaceae family members.
Brassica oleracea
Juglone produced by walnut trees suppresses growth and productivity in brassicas and other susceptible plants within its root zone and drip line.
Notable Cultivars
Thomas and Carpathian are grafted cultivars selected for larger, thinner-shelled nuts and earlier nut production compared to seedling trees.