Q: I think that you mentioned on one of the shows that there is a chemical that will kill zoysia that has creeped into my mondo bed. Could you send me the name?
A: The chemical sethoxydim (Vantage) is labeled for use to control grasses in liriope but not mondo grass. You could try it on a small spot and see what happens.
You could also experiment with products containing fluazifop (Green Light Grass Out)