grow yacons from cuttings

I want lots of yacon plants (I sell plants and everyone wants them because diabetes and people are crazy with weight loss and what else?) so I tried to do yacon cuttings. Of course they won't take as I did it at the onset of winter but I still did it. I found a youtube video and a lady in a warmer climate did exactly that (not at the onset of winter of course): yacon from cuttings
The video doesn't show much, just a normal cutting procedure.
Did someone try that method? How did the plant do later? Did it form tubers in the first year at all?

Thanks for sharing that video.  I've embedded it below.

Angelika, did you ever try this?