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Biennial thistles of Iowa

Encyclopedia Article

Biennial thistles are commonly found in Iowa's pastures, roadsides, CRP and other un-tilled areas.  Musk (Carduus nutans ) and bull (Cirsium vulgare) thistle are exotic species (originate from outside of North America) and are responsible for the majority of problems caused by this group of plants.  Tall ( Cirsium altissimum), Flodmans ( Cirsium flodmani) and field thistle (Cirsium discolor) are native to Iowa and far less prevalent than musk or bull thistle.  Although all species in the Carduus an

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