You think you have a problem with 1 walnut tree. I have at least 40 in the side yard! We didn't plant them, the people who lived here before us did. I don't know what was going through their heads when they planted 40 walnut trees!!! We have more squirrels, (and twisted ankles, they are the worst thing to have laying on the ground) than any where around. But I know exactly how you feel. Too many walnuts!!!!