I'm in Southern California and have a Palos Verde Buffalo Grass lawn that I installed last spring. I get "old" St Augistine grass that still wants to grow in the lawn. As well as two different types of clover (one that has a single base and another that spreads). Is there anything that I can use to get rid of these problems. FYI - this grass is a very new bred in the area. I'm one only a handful of people who have it. It's very diffcult to get information on maintenance.