I have bazillions of them in my outside bogs, mostly due to pulling them out trying to weed, and then several plants growing from root segments I have left in the soil, which only makes my problem worse.
If you do want to propagate them, your best bet would be with root cuttings, unpot the plant in spring and take off a foot or so of the black roots, or more if it is well established, cut them into 2" segments and just cover with a sprinkling of peat 1/4" deep and keep wet.

Cheers
Steve
 
Binata fiddle heads! I brought it in from the cold after a couple frosty nights, it’s exploding with new growth now.
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