Top dressing is important for roses. Add one or two inches of good organic matter in and around the plants, taking care not to disturb the roots. Lori likes a material that is well composted, something with a lot of different sized particles, a product with a little nutrient charge included. Something with phosphorous, nitrogen, even some bone meal as well as some iron is good, since these ingredients tend to green the leaves. Top dressing will keep Roses looking good year after year.