It might have a common name of foxtail but a lot of plants go by that name. I just came in from pulling a bunch of it out of my St Augustine lawn. If you can find the center of the plant, it really comes out easy with a Weed Hound tool. My St Aug just got 4 inches of rain this week and made the centers hard to find, so I did a lot of hand pulling.

I wanted to add another picture, I can go take a few more if needed.

I'm 90% certain that it's what bp said above - K-31 fescue (I think it's short for Ken31 - nothing like a little marketing to trick the old consumer, but that's another topic). My understanding of this grass is that it's "contractor grade" - very often found in generic grass seed mixes sold in the past. I'm willing to be corrected, but I believe it's much less common now, as improved varieties of fescues have become available. I have several patches - it blends fairly well, but can be noticable once you a.) know what it is and b.)becomes a big enough "clump" that it starts growing "sideways". I haven't heard of it spreading, much less aggressive spreading. Because of its horizontal growth, it may appear to be getting bigger, but I suspect the "root zone" has stayed the same, and it's just the blades of grass that get longer w/o being cut. If you're just trying for a green grass, it's not all bad - even in the middle of our high humidity, high heat summers, I don't recall it ever going dormant (i.e. not green)like bp alluded to - but his "droughts" are much more severe that what you or I would normally experience. If you want a uniform looking lawn, than R/U or the traditional mechanical method of foot and spade for removal are likely your best bet. Around here, KBG sod is about $1 / sq ft. At this point in the growing season, I think that would be your easiest bet. Yes the roots may grow deep on the existing K-31, but even if a few blades manage to poke back up through the new sod, I would think it would be a while before you even noticed they came back. Best of luck with your efforts - and please let us know what course of action you decide upon, Gags

Sounds like a weed & feed or the clover killer is needed. Go back and overseed the patches.