I spray it prett liberally, and pretty often. Never seen it stunt of hinder grass. Had buckhorn plantain pretty thick after my first cutting of hay. It was right on the fringe of being too late to spray. Went with about 3 pints to the acre. Smoked the plantain, but seems to have stunted the grass in its tracks. Tips of every leaf is yellow. Never seen this before, and may not be the 2 four d s fault. What say the group? I’ll try to get a pic if I can remember.