Answer: According to the American Horticultural Society's book, "Plant Propagation," peonies are propagated only by division or seeds. Seeds are doubly dormant, meaning they need two periods of chill. First, they are sown in pots and left outdoors to be exposed to winter cold. The first summer roots will develop, but they need a second winter of cold before shoots appear. Plants can take five years to reach flowering size.
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