| Juan, that's a very big rose for a pergola but it can be done. You shouldn't need to prune now until after it flowers again next May. Keep tying the new canes in as best you can. Next Spring flowering shoots will grow from the canes - particularly from the horizontal ones, and also some long non-flowering laterals will grow. After flowering, prune back the flowered canes to a fresh new cane, or cut it out completely. When the rose is mature it will be producing far more wood than you can use. Just keep the best and longest canes each year and remove the rest. Also don't hesitate to cut canes to the length you need. By pruning after flowering to new wood, you are giving the rose the remainder of the Summer to grow long canes to flower the next year, so try to do it by perhaps the end of July. Hope this helps a bit! Jon | 
