One of my customers planted grass in mid September. It came up fairly well, but most of it never got to point where it needed to be mowed. I did mow it(at 1 3/4") once to cut down the few unsitely weeds. The customer did fertilize the lawn with some form of winterizer in early November. My question is: Should I apply a pre-emergent or wait until I mow it 3-4 times and apply a post-emergent? My thought right now is to fertilize it in late April and then about the first week in June apply a good weed-n-feed. What are your thoughts?