 Diligence. Well, there are those who would say with a lawnmower, but I would not say that with a lawnmower. The problem is the roots have gotten a little bit shallow, and so therefore it's easier for them to sprout. So, yes, you need to cut them off and carefully. But then after that, it's a matter of mulching and also, frankly, reducing the amount of fertilizer that you're using on the tree or targeting it.