walnut tree bark as a natural herbicide

Julie Sessions sessions at amrf-po.pmeh.uiowa.edu
Fri Jul 8 16:16:59 EST 1994

     Is it true that the bark from walnut trees, mulched or otherwise, works 
     as a natural herbicide?

     Is it selective in it's toxicity or does it attack everything 
     (i.e., broadleaves, monocots)?

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