I've got a relatively young yard, I seeded it 2 years ago this May. Unfortunately, a thunderstorm blew in later in the week and blew much of the seed away so the grass didn't come in terribly thick and the weeds filled in. So the question of the day, do I go with a "weed and feed" application or a fertilizer with crabgrass preventer? Last year, I applied a fertilizer with a crabgrass preventer and minimized any crabgrass growth, but I didn't make much progress against the other weeds. My gut says to apply the weed and feed this year. I live in Iowa so we are just this weekend starting to see a little greening up of the grass.