Re: CULT: toxic Canada thistles?
- Subject: Re: [iris-talk] CULT: toxic Canada thistles?
- From: B* S*
- Date: Mon, 01 Oct 2001 09:01:05 -0400
On 9/29/01 10:33 PM, "John Bruce" <jbruce@infinet.com> wrote:
> Laurie--
>
> 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.
Is it not possible that the effect is simply due to robust competition from
the thistles and shading of the clumps by their vigorous growth? While many
plants do produce inhibitors, I don't recall this being said of Canadian
thistle.
Bill S.
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