SelecTree: Tree Detail

BLACK WALNUT
Juglans nigra

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Photo Locations: Morton Arboretum - Lisle, IL, Louisiana State Arboretum - Ville Platte, LA, Los Angeles County Arboretum - Arcadia, CA, Hoyt Arboretum - Portland, OR, Cal Poly State University - San Luis Obispo, CA, Davis, CA and Arnold Arboretum - Boston, MA

General Notes

Fairly drought tolerant. Requires a moderate amount of water. Hardy to 10 degrees F. Wood is valued by woodworkers for its strength and beauty. Black Walnut produces Juglone, an organic compound that is harmful or toxic to many other plants. The toxicity extends out from the trunk with the greatest concentration at the tree's dripline.

Has fragrant Leaf.

Native to Eastern North America.

Family: Juglandaceae

Tree Characteristics

Erect or Spreading and requires ample growing space.

Oval or Rounded Shape.

Has Deciduous foliage.

Height: 100 feet.

Width: 70 feet.

Growth Rate: 24 Inches per Year.

Longevity Greater than 150 years.

Leaves Pinnately Compound Odd, Medium to Dark Green, Gold, Deciduous.

Flowers Inconspicuous. Flowers in Spring. Has separate male and female flowers on the same tree (monoecious).

Prolific, Brown, Yellow or Mostly Green Nut in Fleshy Husk, Large (1.50 - 3.00 inches), fruiting in Fall Edible.

Bark Black or Dark Brown, Fissured.

Shading Capacity Rated as Moderate in Leaf.

Shading Capacity Rated as Moderate out of Leaf.

Litter Issue is Dry Fruit.

Tree Site Conditions & Constraints

Sunset Zones 1 - 9 and 14 - 21.

USDA Hardiness Zones 5 - 9.

Exposure Full Sun to Partial Shade.

Wet to Dry Soil.

Drought tolerant.

Loam or Sand Texture.

Highly Acidic to Slightly Alkaline Soil pH.

Seaside Tolerance is Good in Mild Zone.

Pests & Disease Information

Resistant to Verticillium. Susceptible to Beetle Borers and Caterpillars, Armillaria, Anthracnose, Phytophthora, Root Rot and Virus.

Health, Safety & Environmental Concerns

Branch Strength Rated as Strong.

Root Damage Potential Rated as High.

Allergy and Irritant Health Hazard.

Biogenic Emissions considered Moderate.

Desirable Wildlife Plant.

Attracts Squirrels.

Cite this tree:
SelecTree. "Juglans nigra Tree Record." 1995-2019. Nov 22, 2019.
< https://selectree.calpoly.edu/tree-detail/juglans-nigra >

This tree is not part of the SelecTree Nursery Connection. If you would like to see this tree listed, or know of a nursery that sells it, please contact us at ufei@calpoly.edu.