Jennifer - For some reason, I don't get volunteers pretty much from anything.
Even my beebalm stays pretty much where I planted it. Only thing that seems to have spread without abandon is my irises & bluebeards. Otherwise, all my salvias, my agastaches, my penstemons.. they all stay where I planted them & don't go anywhere. And I don't deadhead in the fall, so the seedheads stay there & can go wherever they want. But no babies.
Oh, I lied. My catnip is taking over my yard, as is the vinca. It's becoming VERY aggressive...