Hi Bug-guy, I have the following weeds in my yard: Worst Weeds in my yard, taking up lots of area: Prostate Knotweed Spurge Carpet weed (i think) and couple others. The weeds that I am least concerned about in my lawn are: Dollar Weed Oxalis stricta Current strategy: Ortho weed b gone for southern lawns on early and less concerning weeds. Roundup placed as precisely as possible on the "worst weeds" that are not killed by even a potent dose of the ortho weed b gone. There are a few areas where I'm going to just clear the whole area as the weeds a predominate on those areas. When I feel that I have given the St. Augustine a fighting chance, then I'll deploy the slow release nitrogen fertilizer. My concern is that the weeds will also grow faster with the fertilizer. This is why I am wondering if I should definitely over seed with bremuda or another type of grass... I don't care if the St. Augustine chokes out the bremuda, It's just all about weed control at the moment. What do you guys think?