trifluralin?

I received an email from a hosta beginner and she asked the following question. Does anyone out there know the answer?

>Will the active ingredient "trifluralin" contained in
>PREEN and Miracle Gro Weed Preventer kill my hostas??
>
> One product says it's safe around hosta and the other omits hosta from its
>list of safe plants.
>
> Thanks.
> Ann Pulliam
>


Kevin P. Walek
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