A corner of my front yard has an infestation of crabgrass which I have tried to control --likely not doing a long enough schedule consistently. it's back with summer watering and heat in Sacramento CA. not sure if I need to wait till fall or do something now other than handpulling excess weeds. Here are a couple of pictures ( the rest of the yard is ok, only a truggle with Mexican Heather volunteers there (lol).