I am trying to 'get rid' of some mondo grass so it will not keep reappearing each year in a particular spot. I have tried tilling the area up, but that hasn't worked.
Certified GKH Gardening Expert
You could try using a product called Finale. It breaks down easily so that it doesn't remain in the soil. Your best bet, however, may simply be digging it up and then spraying the sprouts that pop up until it is finally eradicated.