Need some help- I have a west facing steep slope. Retaining wall at the bottom. Riverfront. There is vegetation on the hill but mostly weeds. Was planning on putting down a landscaping barrier for weed control. We were told by some other waterfront owners that a good erosion control method is a product that is basically plastic w/ woven hay. We were going to put this on top of the weed barrier, then plant junipers and organic mulch around the junipers. Not sure about putting both weed barrier and roll? Any thoughts??