A review of suitable companion crops for black walnut

Robert Scott, William C. Sullivan

Research output: Contribution to journalReview articlepeer-review


Black walnut (Juglans nigra L.) is a temperate tree grown for nuts and wood, but it is allelopathic to certain plants and animals. We compiled reports of valuable black walnut companion crops which may be grown in the short term (<15 years after planting walnut trees), medium term (15-30 years), and long term (>30 years). There are many black walnut companion cropping systems for the short and medium term, but there are few for the long term. Companion crops for black walnut serve multiple functions, including nitrogen fixation, added yields, the development of straight walnut stems, and added protection from forest pests such as deer. Black walnut polyculture is a viable alternative worthy of further development and implementation.

Original languageEnglish (US)
Pages (from-to)185-193
Number of pages9
JournalAgroforestry Systems
Issue number3
StatePublished - Nov 2007


  • Allelopathy
  • Juglans nigra
  • Juglone
  • Permaculture
  • Polyculture

ASJC Scopus subject areas

  • Forestry
  • Agronomy and Crop Science


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