Answer: Unfortunately, planting them too deep can cause peonies not to bloom, but transplanting or resetting them can cause them to take a year or two to readjust and begin blooming, too. The smaller the initial plant, the longer it will take to build strength to bloom as well. Peonies really do best in full sun all day, but if your six hours of sun include the hour of noon that should be enough for them to bloom, although less than full sun can slow their growth. Other problems might be competing tree roots or possibly low fertility. You might give them a complete fertilizer early each spring along with a top dressing of compost and see if that helps them grow a bit faster.
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