Propagating Aralia nudicaulis

Last year, the local population of Aralia nudicaulis dropped their flowers with no seed set.  This year, the same again.  Does anyone have experience (or a reference) for propagating them from rhizome cuttings - timing, medium, homone treatment, etc?
 
Thanks, Russ
 
Underwood Shade Nursery
PO Box 1386
North Attleboro, MA 02763
508-222-2164
fax 508-222-5152
USDA zone 6a
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