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 ...

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 ...

Another study focused on the late-autumn sprouting behavior of three creeping perennial weeds, including Cirsium arvense. The research revealed that different species exhibited varying sprouting ...