Scotch thistle is a native to Europe and Asia that has become a spreading invasive species in Arizona, particularly near disturbed areas — where the ground cover is destroyed or removed ...

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). Canada thistle forms extremely extensive root systems that need to be repeatedly damaged to keep them from growing back ...

May and June are the months when we frequently see both native and non-native forbs begin to grow and start to flower in range and pasture. If you are seeing “pretty flowers” ...

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 ...

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 ...