Been looking for something that would kill crab grass for years. Tried every product out there. I did not expect this one to work either. Imagine my suprise when it did! I have an acre so it was pricy to spray the whole yard but was very effective. It killed about 90%. One viriety seems to be industriable. Other products I have tried would make it sick but would not kill it. They should put it out in a larger container. When I filled my 30gal sprayer it required 4+ 16oz bottles. Good product!
Since starting a spray routine to rid myself of Creeping Charley as well as Crabgrass in a mixed lawn of weeds and Bermuda grass. it seems to be working well so far; it will take awhile for the Creeping Charlie part as it is the very worst weed to get rid of as nothing kills it right away in my experience, including Glysophate.
My crabgrass was established so it took two applications to get some results. I'm still waiting to see if the crabgrass is totally killed -- most has yellowed so I'm assuming that it will eventually die.
Pay close attention to instructions. They are a bit cloudy for this old brain.
Apparently I didn't get it right because results (although some visible) were spotty, at best.
I'm writing this off as user-error. It would help if mfg (or marketing or customer svc) would phrase mixing instructions for DIY using 1-gal sprayer.
(and yes, I also used a commercial surfactant)