Previous species
Previous Species

Next Species
Next Species

Home Page

Order CD-ROMs from the site

Tell a Friend

Gardening Books

Gardening Catalogs


Black Walnut, Eastern Black Walnut
Scientific Name: Juglans nigra L.
Family: Juglandaceae
Black Walnut, Eastern Black Walnut (Juglans  nigra)
Juglans nigra, Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 1: 579.
Recommended Temperature Zone:
sunset: 1-9,14-21
USDA: 4-10

Sun Exposure: Full sun

Origin: Eastern North America, southeastern New Brunswick to northern Mississippi

Growth Habits: Deciduous tree, 50 to 75 feet tall (15-23 m) or more; alternate, odd-pinnately compound leaves, with the terminal leaflet missing or misshaped, 12 to 24 inches long (30-60 cm), with 10 to 23 serrated leaflets, 3 to 5 inches long (7.5-12.5 cm), odoriferous when bruised

Watering Needs: Moist, well drained soils, relatively drought resistant

Propagation: Named varieties are grafted on same species seedlings

Juglans nigra bark, Robert H. Mohlenbrock. USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species.

Cultural Practices:
The black walnuts are difficult to transplant because of their long tap root. They secrete a substance (juglone) that prevents close-by plants to grow.

Blooming Habits:
The male flowers are long catkins, 2.4 to 5.6 inches long (6-14 cm). The female flowers are yellowish green, on short spikes, close to the end of the twigs. The black walnut blooms in the spring (April to June).

Fruiting Habits:
The fruit is a round nut, 1 to 1.6 inches in diameter (2.5-4 cm), containing a tasty, oily seed, ripening in the fall (September-October). It is surrounded by a very hard thick shell. The trees start producing seeds when they are about 20 years old.

Sponsors: Michigan Bulb - 120 x 60 Lawns Banner! Gurney's 120 x 60 A

We do get a small commission out of these sponsors that helps financing the website.  Let us know if you are satisfied or dissatisfied of their services, since obviously we are trying to advertise only for reputable garden supply companies.  They might be helpful to get plants not generally available at the local garden center, getting a new and unusual gardening tool or get a discount Better Homes and Gardens magazine subscription.


Desert Tropicals Home Page | List of All the Plants | More in the Juglandaceae family | Tell your friends about this page

Desert-Tropicals is dedicated to provide gardening advice, gardening ideas, and information about flower of all kind for landscape and collections. We try to check carefully the identification of the plants on the illustrations as well as the other information from the page, but occasionally errors do occur. if you notice anything that needs to be changed please contact us. Thanks.

1998-2005 Philippe Faucon, All Rights Reserved.