Pull out young crabgrass asap! Immature crabgrass plants have tight, green seed heads. They're more difficult to remove, but it's still OK to pull them. Fully mature crabgrass has splayed seed heads. It's best to leave it alone. Pulling will leave a big hole in the lawn and spread up to 5,000 seeds per plant. The plant will die in the fall. Then hit the area next spring with preemergence granules to keep the seeds from sprouting.
