I have to admit I have not had success propagating roses from cuttings. They would start growing roots and buds develop into little leaves, then they died,
I guess I tried as a project off and on 3 or 4 times. But material I had to work from were all hybrid tea roses and I refuse to use chemicals. So the problem lies somewhere between those two "disadvantages" I guess.
Some day when I return my attention to roses and apply all the new information I've learned from more recent experiences, I think I'd like to try again with old fashioned cultivars that don't rely on grafting.