I have been taking care of a new account this year that has 15 knockout rose bushes. No one has ever pruned or trimmed these things back and they are out of control. They are blocking windows and just look like a huge mess. I have never pruned or taken care of any roses because I personally do not like them and would never grow them in my own yard. I would appreciate if you guys could give me some tips on how and when to prune these plants. Also any fertilizing tips you might have.