It's time to fertilize! Always put the first fertilizer of the season down the week of Easter. The holiday serves as a great reminder that it's time to feed the lawn. If crab grass is a problem you may want to put down a pre-emergent as well. Be sure to zap any dandelions at first glance. One little parachute will spread up to 400 seeds giving you 400 wishes that you didn't let that pretty little yellow flower bloom in your lawn.