I now have a company that comes by and puts down pre-emgergent twice a year and fertilizes throught the year. I think the total is 5 or 6 times. Thay have already been here once this year. My question is that I have a couple of places I need to spread seed in. If I break up the surface soil a little bit and sow seed will the pre-emegernt stop the seed from germinating? Or does the pre-emergent create a blanket on the soil surface and by tilling the area I will sow will that allow the seed to germinate? I will be spreading a blend of fescues mixed with some bluegrass.