Answer: Tree peonies can be planted in the fall, or in the early spring, in rich, deep soil. Keep the plants away from competing tree roots and be sure to prepare the soil by adding peat moss, or other organic matter. Set the plant a few inches deeper than it grew in the nursery container. Tree peonies will bloom best after a pronounced winter chill. Be sure to plant it in full sunshine, and where it will protected from strong winds.
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