Chances are if you have driven along any country road in Illinois, you have seen a tall plant with a spiky silvery thistle-like flower head swaying in the wind. What you may not know is that this plant hides a sinister side. Cutleaf teasel (Dipsacus laciniatus) and its relative the Common teasel (Dipsacus fullonum) are prairie “bullies” and have been slowly taking over our high-quality agricultural landscapes.