For more information visit Midwest Invasive Species Information Network (MISIN). Canada thistle forms extremely extensive root systems that need to be repeatedly damaged to keep them from growing back ...

Scotch thistle is the most common thistle species in New Zealand with spines on both the leaf surface and margins. Scotch thistle is a biennial weed, so it depends quite heavily on the establishment ...

The Yakima County Noxious Weed Board has been helping landowners control problem and noxious weeds since 1975. Contact them at 509-574-2180, email [email protected] or visit ...

For more information visit Midwest Invasive Species Information Network (MISIN). European marsh thistle can colonize areas quite aggressively and can be difficult to remove from areas due to the wet ...

Native thistles are integral to the local ecosystem; some, like the Sacramento Mountain thistle (Cirsium vinaceum), for ...