Hi, all, I have a question about using Preen (or a similar product). I am not a gardener and do not have time to attend to flowers, gardens, etc. I have replaced all of the mulched beds with rock borders containing landscape plants such as fountain grass and liriope. However, windblown seeds are growing in the rock borders between the rocks on top of the fabric underlay. I have been handpulling the weeds, but I was wondering if I could safely apply Preen to the weeds between the grasses and liriope without killing them (the fountain grass and liriope). I have never used Preen before, and don't really know a lot about it, so can I? Or not. If I can, what is the best way to apply it? Thank you