I live in Chicago, and just put down the Scott's Turfbuilder with halts a day back. My question is this... I moved into our current home last April and have found an average sized area (12' x 12') in my backyard with crabgrass. With the recent fertilization, what else should I be using to get rid of the crabgrass? I know the halts 'prevents', but does that also mean it will stop the crabgrass seeds from germinating? I understand (at least I think I do), that the crabgrass dies off in the later fall, and when Spring comes, germination for crabgrass seeds begin (I've read that this happens around the time of the lilacs blooming...who knows). Has my fertilizer application with the Scotts Tbuilder w/ halts stopped it pfrom germinating, or am I just stopping it from spreading. Am I missing a window to get rid of the crab grass I have already had? Sorry so many questions, but I'm sure there will be other watching eyes on any replies. Thanks.