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market-farming - Re: [Market-farming] black walnuts trees

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  • From: "William H Shoemaker" <wshoemak AT illinois.edu>
  • To: "'Market Farming'" <market-farming AT lists.ibiblio.org>
  • Subject: Re: [Market-farming] black walnuts trees
  • Date: Tue, 30 Mar 2010 14:41:58 -0500

Black Walnuts produce a phytotoxin, juglone, which will inhibit the growth of many species of plants. Most vegetables can be affected. The high-risk zone is anything within 1.5x the drip line. Some think its more because it depends on sensitivity/tolerance and movement of walnut debris.

 

Bill

William H. Shoemaker

Sr. Research Specialist, Food Crops

University of Illinois - Crop Sciences

St Charles Horticulture Research Center

535 Randall Road, St Charles, IL, 60174

630-584-7254, FAX-584-4610

wshoemak AT illinois.edu


From: market-farming-bounces AT lists.ibiblio.org [mailto:market-farming-bounces AT lists.ibiblio.org] On Behalf Of E C GRANATA
Sent: Tuesday, March 30, 2010 2:01 PM
To: Market Farming
Subject: [Market-farming] black walnuts trees

 

Folks:  I remember that black walnut trees are not friendly to gardens, but can't remember particulars.  Can anyone help?  How far from the tree -- from the trunk? from the drip line?
 
The grass and flowers seem to grow well enough under and around it.  Are there certain crops that won't tolerate the tree?
 
Many thanks for any help with this.  Almost 80 today, for a change
 
Elaine
Denver, Zone 5ish.




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