DON'T FEED THE WEEDS!

Pre-emergents should be applied twice a year to kill summer AND winter weeds.

 Generally, you can apply pre-emegents in March and September. You must apply pre-emergents before the growth of weeds, because it will not kill existing weeds. They are designed to prevent the seeds of weeds from germinating; therefore, you should use weed killer on weeds that are already growing on your lawn.

 Application dates for applying pre-emergents can be different than your fertilizing dates, because you should apply fertilizer after your grass has come out of dormancy. If you apply a fertilizer that is high in nitrogen before it has a chance to grow, you inadvertently feed the weeds.