Works on Nutgrass. Took 5 days to brown and kill existing Nutgrass. Does not prevent new ones as per product descrption. Leaves existing lawn green which I like. Does not work with CrabGrass and some weeds in my yard. Overall I am happy with the Product, hoped it would kill more of the weeds in my yard. Dismiss works better than my lawn Maintenance company weed killer - Money better spent.