They spread via seeds and stray plant parts. Since musk thistle (Carduus nutans) can produce over 20,000 straw-colored seeds singularly, it quickly carpets the area, outcompeting native vegetation.

Canada Thistle is a class C noxious weed native to Europe and Asia. This weed is considered noxious because, once established ...

The Wyoming Natural Diversity Database (WYNDD) at the University of Wyoming has released a new field guide on Wyoming thistles, designed to assist those who work or recreate outdoors in identifying ...

As a public service, the herbarium offers free plant identifications. For more information, call 803-777-8175 or email [email protected].

Improving your soil will weaken thistle and help desired plants grow better. We recommend investing in a $9 soil test kit from your local extension office. Thistle has an extensive root system.