I am looking to apply a growth regulator to my home lawn(I don't do apps commercially). My questions are for those of you who use them. What is the best pgr for cool season grasses and what do you use to apply them? I don't have a tank sprayer but I will buy a back pack sprayer to use, if that will work? My lawn is 2700 sq feet, not alot but a pita to mow and I hate mowing my own lawn. I've seent that some of the cheaper growth regulators will yellow the turf so what does everyone use?