I live in a new neighborhood and the builder put in a bad load of grass sod in my yard that has a ton of bermuda. I have heard that if you let St Augustine grow pretty high it will choke out the bermuda. My problem is it is not working. The bermuda (which I think is not a lawn variety) grows just as high if not higher and has not decreased at all. Right now too it is producing what I assume is a flower (it looks like a crow's foot). Is there anything else i can try, or do i need to look into resodding.