Cutting back roses

I always thought that all plants that have flowers should be cut back in the fall. During the summer when the bloom starts to die I cut off the plant a little so it will continue to bloom until fall. So far I haven't killed anything and the plants always bloom again the next season. I've always used Miracle Grow made for roses also which helps them stay healthy. If it wasn't for Miracle Grow I think everything I have in my yard would die. My soil is hard as concrete. Lisa