Cut the spindly canes back by half their length or to 2 to 3 feet long. Cut or break off canes completely that grow from below the graft union. Remove diseased canes and those that rub or crowd others. If you see brown tissue in the center when you cut, prune a little farther back until the tissue is clear and healthy. Make the right pruning cut. How to Prune Roses Step by Step. Use clean, sharp tools.
Start at the bottom of the bush and work up. Prune less in the beginning. You can always go back and cut away more unwanted growth. Most mistakes grow back just fine. Prune dead wood back to living plant tissue with an anvil pruner or lopper.