Maybe till it then rake it out?? Or do a controlled burn...Only problem is that if you're allergic, burning will allow you to inhale it which is worse than anything. Maybe do sections. I have it all but we just live with it, of course I do any chores that are close to it because my GF is highly allergic LOL, but I find that if I dig it up by the roots and throw it in the trash it's slowed down some of the spread.