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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: Wed, 31 Mar 2010 09:14:19 -0500

English walnuts don’t produce juglone. I suspect the grain crops were unaffected, but I’ve seen other crops affected. That includes blueberries I planted as a landscape planting at my house. I’ve grown blueberries successfully before, and these started out okay. But they were within 25’ of a black walnut. They just never thrived like they should. I thought because they were both natives the blueberries would be tolerant. So much for thinking! And I’m aware of folks who had the same problem with tomatoes. If at all possible, avoid them.

 

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 sunnfarm AT netscape.com
Sent: Wednesday, March 31, 2010 8:23 AM
To: Market Farming
Subject: Re: [Market-farming] black walnuts trees

 

I have a single English walnut which I guess is not much different than a Black next to a field that I don;t plant anymore but when I did I grew tomatoes broccoli cauliflower and sweetcorn through the years with no ill effect. My neighbor has many Black walnut trees along the tractor path planted on both sides with field corn wheat and soybeans and the crops grow well enough. I think a lot of the problems people see  especially near the drip line is the tree taking up all the available water and throwing shade over the plants that is harming vegetable growth... Bob. 

--- elainegranata AT msn.com wrote:

From: E C GRANATA <elainegranata AT msn.com>
To: Market Farming <market-farming AT lists.ibiblio.org>
Subject: Re: [Market-farming] black walnuts trees
Date: Tue, 30 Mar 2010 18:38:05 -0600

Bill: Thanks for the reminder -- juglone.  Found some other material from Purdue, and other university web sites that say that squash, melons, beets, carrots, corn, onions and parsnips are tolerant if you're 50' from the drip line.
 
Opening some new beds so have to decide if I want to take a chance.  They just barely clear the 50'.
 
Thanks,
 
Elaine


From: wshoemak AT illinois.edu
To: market-farming AT lists.ibiblio.org
Date: Tue, 30 Mar 2010 14:41:58 -0500
Subject: Re: [Market-farming] black walnuts trees

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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