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All Edibles  ::   View All Juglans  ::   View All nigra

Black Walnut

Juglans nigra

Black Walnut, is a fast-growing Midwest native tree of bottomlands and open fields. Its beautiful, fine-grained wood is prized for woodworking and quality veneer. Nutmeats enjoyed by humans and wildlife. Juglone, a natural allelopathic chemical produced by walnut trees inhibit growth of nearby plants. Those particularly affected include tomatoes and related plants like eggplants, chiles, potatoes and petunias. In addition, some ornamental plants are also sensitive, such as potentillas, lilacs, columbines, lilies, and peonies. These plants should be grown 50 feet or more outside of the walnut tree's dripline. 

Valuable timber tree
Good nut producer
Can inhibit growth of nearby plants

More About Juglans nigra:

The type of relationship between plants, like Black Walnut, in which one produces a substance which affects the growth of another is known as "allelopathy." In fact, Black Walnut is famous for root production of juglone, a chemical that is toxic to some nearby competitor plants. In a woodland setting, very few plants grow under the canopy of this species.

Aside from leaf spot, Black Walnut is virtually disease and pest free. When summer drought occurs, the response of this tree is to begin dropping leaves, in spite of its deep taproot system. The Black Walnut is not the best urban tree because it requires much clean-up from dropped leaflets, dead twigs, stain-laden whole fruits and debris from squirrel feeding.

Gardening Suggestions for Black Walnut:

Produced using Forrest Keeling's patented RPM Root Production Method ® technology for exceptional growth and survivability. Contact us about grafted walnuts. These are available on a contract-grow basis. Check all our available seed-grown walnut cultivars. "Thomas Black" and "Carpathian" are also available in bare root format. "Carpathian" is a cultivar with seed origin in Michigan. It has tolerated winter temperatures as low as -34 degrees.

Key Characteristics:

Midwest Native
60-70 Feet
35-40 Feet
Hardiness Zone:
4 - 8

RPM: Scientifically Proven to Grow Faster and Healthier

Forrest Keeling Nursery is the world-renowned originator of the RPM (root production method®) RPM technology. Our patented RPM tree technology yields unsurpassed survivability and plant growth, which makes Forrest Keeling plants the benchmark for wetland restorations and large-scale installations in any application.


Additional Characteristics & Attributes

Attracts Wildlife
Upland Birds and Game
Soil Moisture Preference
Full Sun
Grow Native!
Midwest Native
Icon Legend

Characteristics Key

Deer Resistant
Rabbit Resistant
Humming- birds
Moist, Well-Drained
Wet Soil
Cut Flower
Midwest Native
Dried Flower
Salt Tolerant
Drought Tolerant
Great Foliage