Why it is every year I get lots of crabgrass around this time?? My lawn has virtually zero crab grass up until Mid August or so - then it honestly starts to get a little out of hand. I've just been pulling it but it's a losing battle. I always though crabgrass was more of a problem in the spring. Should I have used a pre-emergent? If so, when? I always thought that a pre-emergent was applied in March or April no? If I had applied it back then, would it have prevented the crabgrass from sprouting now?? FYI - I'm in CT.