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Re: CULT: toxic Canada thistles?

  • Subject: Re: [iris-talk] CULT: toxic Canada thistles?
  • From: "John Bruce" <jbruce@infinet.com>
  • Date: Sat, 29 Sep 2001 22:33:19 -0400


Very much so. There must be some substance produced by the thistle 
to reduce competition from neighboring plants. We got a stand of
Canadian thistle in one row of our stock plantings, and while it did
not kill the irises, their growth was definitely inhibited.  We have obtained
an herbicide that is supposed to be lethal to thistle and other weeds while
having no effect on the irises. We plan on testing it this season and next,
because our iris farm is very much in the country, and the thistle can be 
rampant. The herbicide, Stinger, is however on the expensive side.

John Bruce
Hidden Acres Iris Gardens
  ----- Original Message ----- 
  From: laurief 
  To: iris-talk@yahoogroups.com 
  Sent: Saturday, September 29, 2001 11:01 PM
  Subject: Re: [iris-talk] CULT: toxic Canada thistles?

  >       I feel like I may be "preaching to the choir" when I talk with 
  >you!! I had thistles in Arkansas. The trick, secret, whatever, is 

  Indeed you are preaching to the choir, Doris.  Although there are far too 
  many thistles around the farm for me to make any attempt to wipe them all 
  out, I sure as HECK can keep them under control in my gardens!  I don't 
  allow thistles right around the yard to flower, and as much as I HATE 
  using RoundUp, I do make an exception for the thistles.  It's not a quick 
  kill, but at least it gets them in the end.

  I am still curious about whether anyone else has noticed the apparently 
  toxic effect Canada thistles have on bearded irises.  Anybody?


  zone 3b northern MN - clay soil

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