Answer: Peonies can take three or more years to begin blooming, especially if they were rather small to begin with or growing conditions are less than ideal. A half barrel would be a more appropriate size for a single peony since they grow about that size; however they do occasionally bloom in the nursery pots so it is not an impossiblity. Be sure to keep them well watered and fertilized to avoid stressing them at any time during the growing season. Also be sure to protect their roots from extreme winter cold. (Take care with the terra cotta pot, too, as it may be ruined by freezing weather.) I think I would be patient unless you really think you planted them too deeply, in which case you could gently remove some of the soil from the pot late next winter just before they begin to grow.
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