Note that there is a difference between tree peonies and hebaceous peonies (which die back completely to the ground in winter.) It is actually recommended to plant tree peonies a little deeper than the pot they came in, so that the grafted plant on top can make it's own roots. It is only hebaceous peonies where you need to make sure they are not too deeply planted.
A trowel in the hand is worth a thousand lost under a bush.
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Note that there is a difference between tree peonies and hebaceous peonies (which die back completely to the ground in winter.) It is actually recommended to plant tree peonies a little deeper than the pot they came in, so that the grafted plant on top can make it's own roots. It is only hebaceous peonies where you need to make sure they are not too deeply planted.