[tzestan]

Same as Arvin, leaf pulling posted here was the only one I performed so far. Next trial will probably be end of this year. I won't be able to comment on what would be the best procedure. The base of rhizome must be kept moist continually in the process. Without cover, I guess let the rhizome buried slightly deeper, like 5mm may help. But don't press the soil hard.

Given choice, dividing a plant with multiple crowns is a simpler way to get more mature plants.