Thank you Zuzu for your last post! I'm slowly understanding why grafting roses has been in practise for centuries. An accepted reason is that it makes rose growers easier to multiply stock. Nowadays I have no doubt that that is an excellent reason. However hidden is the question of longevity compared and that takes decades before comparisons can be made. Added to that the question is site specific. Perhaps it will take a few more decades before the question is settled. I'm happy that I started to learn how to graft roses. Even OGR's although they are usually grown on own roots. I haven't found anywhere where this question has been setttled in the long run with detailed research. That's my scientific mind again....
