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Unrelenting Roundup use has caused 11 weed species to evolve glyphosate resistance in 26 U.S. states, with Palmer pigweed and horseweed the most widespread, according to the International Survey of Herbicide Resistant Weeds.

Now, Roundup-resistant weeds like horseweed and giant ragweed are forcing farmers to go back to more expensive techniques that they had long ago abandoned.

And I know that, in the same mood, she dowered the vulgar horseweed with the breath of the mignonette.