I don't know about propagating it. But, I bet you could get it to root in water probably. I do know that it multiplys rapidly over the years. I have a ton of this that I am getting rid of. I am making new garden beds. The people who lived here befor planted it everywhere. The previous owners gave a little to my nieghbors and years later it had spread all over their hillside. I would guess it would root pretty easily.

Cuttings root easily in sand or potting soil. Cut about 6-8 inches, strip off the bottom leaves, and stick them in the media. Keep moist in moderate light, but not sloppy wet. Hormone might help, but it is not really necessary. Roots form fairly slowly, but quite surely. As mentioned, once a plant starts, it spreads rapidly by near surface stolons, and these can be seperated off to spread it more rapidly.

George