I'm in Bexar county, TX. Lost about a quarter of my St. Augustine last summer. Not sure what the problem was. It started dying near the curb, and just started working its way towards the house, despite the water I started applying. Anyway, the remainder now seems to be doing pretty well, and I've put out pieces of sod, covering about a third of the bare area. I'm watering with a soaker hose, which seems to be doing a pretty good job of saturating the area. I'm sure it's going to take a long while for these pieces to grow together. I thought I might sow a little bermuda, in the area which catches the most sun, when it warms up a bit. In the meanwhile, I've been wondering about these "mixes" you see at Home Depot, which promise a quick splash of green. Something to cover the bare spots, maybe? I'm wondering what would be the downside.