In south Texas, my biggest commercial account has no irrigation system in their parking lot islands. The grass that is there is thin and has some bald spots where nothing is growing. During the winter months, what grass there is goes dormant leaving the area looking dead and bald. I tried seeding with rye just before some rain but, after nearly a month with only a couple days rain, not much is sprouting. I cant do anything about the irrigation system. Would it help to cover the seeds with a thin layer of sandy loam? Or is that just a waste of time? Any suggestions are appreciated.