1. 

   David Waugh Member

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   Location:

   Port Moody

   Are only the black walnut(Juglans Nigra) leaves, nut husks roots toxic to other vegetation or are other members of the Juglans genus also toxic and emit juglone.

    

   David Waugh, Oct 25, 2012

   #1
2. 

   Michael F Paragon of Plants Forums Moderator 10 Years

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   Location:

   Britain zone 8/9

   All walnuts produce juglone, but Black Walnut produces more of it than most other walnuts do.

    

   Michael F, Oct 25, 2012

   #2

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