I haven't tried this way, but it looks interesting, and easy.

http://paulbarden.blogspot.com...

That's a really interesting method, Andi. I've had terrible luck with trying to propagate some of my roses, and everyone else has too, I think, because they're roses that aren't offered by any of the own-root nurseries. Audrey Hepburn is one of them. I bought mine grafted years and years ago from some God-awful place like Michigan Bulb. I've tried to grow it for several friends, but never with any luck. The softwood cuttings grow for a while and then eventually falter and die. Maybe the hardwood method would work on it. Or maybe it just refuses to grow on its own roots.

Does it matter how the cuttings are oriented during the callousing process? ( In other words, how did the pictured cuttings know to grow roots at one end? Were the cuttings held vertically during the callousing process?)

I haven't tried it , yet, I don't know. When I read it, I assumed that they were kept vertical, but it isn't clearly stated.