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Name: Unknown
Status: other
Grade: other
Location: OH
Country: N/A
Date: 4/14/2005


Question:
I was reading the statment that black walnut trees omit a poison that kills around the tree. My question is why do you think this is so.....I have many black walnut trees on my property, I have planted beautiful flower beds around them and they are growing just fine, not dying. I also have a huge one next to the vegtable garden and it does not kill anything in it at least for the last 20 years I have planted it.


Replies:
Black walnut trees do produce juglone that is poisonous to many species of plants, but obviously, the flowers you've planted are resilient.

Also possibly helpful re. plants that are susceptible vs. tolerant of juglone in the soil:

http://www.extension.umn.edu/projects/yardandgarden/ygbriefs/
h407blkwal-tox.html

Anthony Brach Ph.D.



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