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So do I, though I don't have itoh peonies (except one), but also P.lactifloras show a wide range of colours in their shoots. Some are almost yellow and and some very dark. I have P.lactiflora 'Tie Gan Zi', which is not very vigorous and has not very special flowers (no side buds, and many times flowers look a little messy), but it has the darkest spring foliage which stays dark until almost flowering, so it deserves a place just for the foliage.