Black Walnut Tree Information

Black Walnut Tree Information image by Ascending the Giants
Black Walnut Tree Information image by Ascending the Giants


The black walnut tree (Juglans nigra) is a highly prized landscape, food and timber source that is native to North America. Walnut products are an important agricultural crop in the United States.

Native Habitat

Black walnut is native to the central and eastern U.S., but the tree will grow anywhere it receives at least 140 days free of frost and 25 inches of precipitation each year.


Black walnuts can grow up to 100 feet tall, and specimens have been recorded as having a trunk diameter of 4 feet and obtaining an age of more than 200 years.


Black walnut trees need full sun, and they prefer a rich and moist but well-draining soil that has a depth of at least 30 feet to allow for proper root growth.


In addition to harvesting and eating the nuts, black walnut wood is used for sheets of veneer, decorative furniture and gun stocks. In some landscape situations, it can be used as a shade tree.


Black walnuts produce a substance known as juglone that may be toxic to plants growing within 50 to 60 feet of the tree.


  • Growing Black Walnut
  • Black Walnut Toxicity to Plants, Humans and Horses
  • Black Walnut Juglandaceae Juglans Nigra

Who Can Help

  • The Walnut Council
Keywords: juglone walnut, Midwest native tree, grow black walnut

About this Author

Brian Albert has been in the publishing industry since 1999. He is an expert in horticulture, with a focus on aquatics and tropical plants like orchids. He has successfully run an aquatic plant business for over five years. Albert's writing experience includes the Greater Portland Aquarium Society newsletter and politics coverage for a variety of online journals.

Photo by: Ascending the Giants