This time of year, we recommend just leaving it be. It is an annual and will die off with the first frost. Overseed in mid-September to thicken the lawn and help choke out the crabgrass. Do not worry if it is present when you seed, it will be gone soon enough. Next year, apply Green-Up with Crabgrass Preventer at the end of April and Crabgrass and Weed Preventer at the beginning of June. They work well together.
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