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A quick web search for "simazine effects on trees" turned up many articles on this. Check Google Scholar, too, and go beyond the first page. The gist of the articles are the same as for other Atrizine group herbicides: be careful, tree ...

Thanks, Chuck! I was mildly surprised that the label had no precautions about applying around tree roots, as there is for MSM products, as used on that tree we know in Largo. Just warnings about air and water drift. Rain falling on compacted dirt ...

Guy, I don't have direct experience with simazine, However, simazine is in the triazine family of herbicides which includes atrazine, that has been used in our Florida climate and soils for many years. About 25 years ago at a state conference one researcher ...