Identifying features include: Like other thistles, bull thistle is armed with a great number of spines that can and will penetrate exposed skin. For more information visit the Midwest Invasive Species ...

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 ...

Not every animal, insect and plant that is in Tennessee should be here. Take a look at some of the most invasive species in the state.

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 ...