I bought enough lesco dimension (crabgrass pre-emergent) to take care of my lawn. I have a few areas that are "sparse" and I need to top seed these. Can I overseed my yard in places and also apply the lesco, or will the lesco prevent the grass seed from germinating. If I can not topseed about the same time, how long would I need to wait. Right now I am more concerned with the crabgrass problem (based on what I saw last fall) than the topseeding but I need to do both. Thanks for any helpful comments or suggestions.