I suspect that the Black Knight Butterfly Bush no longer exists and a wild rose has taken over that space. Unless the rose has a lot of redeeming qualities, consider removing it and planting a more ornamental plant. Wild roses typically are very thorny and sprout up new shoots near the base, over time creating the "Rose Patch" we hear about. If you are going to prune it, remove all the dead, decaying canes, thin the remaining canes down to just several. You will need to continually remove the spouts as they appear near the base and into the surrounding area during the summer. Each year you will need to leave a few new ones, as the older ones will need to be pruned away. This way you can maintain thesize of the plant.