I decided that I would put some spent grain in the bottom of a flower bed that I was building near the driveway. I just put it down and put top soil over the top of it. Then, I planted a whole series of sunflower seeds in those beds. Now, when I come home I find little holes dug in my beds with spent grain spread all around the top. I'm thinking a good solution will be a watchful eye....and a pellet gun.