The forsythia bloomed in short order. That signals about the last chance to try and control, or reduce, crabgrass in the lawn with a preventative product. There is a good chance some crabgrass has already germinated, but the main germination will be happening in a few days.

There are some postemergence products liks MSMA or DSMA for use on newly germinated crabgrass, but they can be a little tough on your regular grass. There is also a risk of discoloring grass to a blueish shade.