Instruct: Classify a review into positive or negative sentiment.
Query: Doesn't do the job

I've gone through a bottle of this stuff, and it does not kill crabgrass. At 2 tablespoons per gallon, all that will happen is that the crabgrass will begin to fade to partial yellow over a period of 3-4 days, but after a week, the crabgrass recovers and whatever affect that the spray had is soon forgotten. And yes, I went over the same crabgrass twice with the same concentration, 2 weeks apart. I ended up having to pull the crabgrass up by hand in order to kill it.