Zone 6a-

Any idea what this guy is. On my wild back hill... among many other weeds... I get these big guys popping up. I get the standard teasel plants back there too... and these are quite similar. You can see the very serrated leafs which are different then teasel too. They hold water at their leaf axils just like teasel or water cup plant. I typically weed wack them down at some point but they can get 3ft tall at least.