When I originally started using it height restriction was at 30” if I remember right. It loves MSO at 1 gal/100 and I’ve learnt if grass size is getting more than an inch tall to kick that up to 1.5 gal/100. Also it likes AMS. I always run it at 3#/acre. Waterhemp control is better with adding at least 1/2 lb atrazine.