Tree Peonies


I've consulted my old (4th ed.) Taylor's Encyclopedia of Gardening about
the tree peony, P. suffruticosa,  and it says that they are hardy to
zone 4, and favorable places to zone 3, but I see the zone map they use
places me in zone 2.  Question for the list:  how far north have you
grown these?
-- 
Barb Perna
Southeast WI,  Zone 4


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