Sudangrass provides some pretty decent cover. It grows fast, especially with this kind of heat, and it grows very tall. The only thing I don't really like about it is how easily it breaks over and falls down. Toward the end of the season it gets pretty brittle and doesn't last long with regular disturbance. That all being said, it's still worth planting. I think warm season grasses like switchgrass, big bluestem, and indiangrass make for excellent cover. These will grow upwards of 6 or 7 feet tall and form some dense stands. A good stand of warm season grasses will provide cover all through the winter and into the following spring. Maintenance is very easy too... A prescribed burn every couple of years or so and you're good to go.