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The heyday for Palmer amaranth introductions in Iowa was 2016 with the planting of native seed mixes contaminated with Palmer amaranth. I am aware of more than 30 counties where Palmer amaranth was found in CRP fields following planting of contaminated seed mixes.

Canada thistle has been a consistent threat to crop production and perennial habitats since its introduction to the area in the late 1800s. Canada thistle is commonly found in crop fields, pastures, hay fields, CRP and other full sun habitats.