Hi All, I need some help. I have a couple of bird feeders on a pole in my yard and the seeds fall on the lawn below. I made an open box frame under the feeders, put landscape fabric in it and then filled it with river stone. after 2 weeks, all sorts of plants are coming up through the stones. How do I get rid of them? I thought of replacing the stone with sand to be able to rake it once a week or so, but I'm not sure that this will work. Any ideas would be appreciated.