That is great news Karen. I was mentioning this to the fellow in charge of plants at our botanical garden. We have just about every gold medal winner except one that I cannot find and three tree peonies. We have two TP that I purchased for the garden and put in the research bed as an experiment. They both have pips so the next trick is to see how they fare over winter and if any blossom buds blast next spring. I think they would consider a little TLC for those few trees we might get to fill out our collection. Am also working on filling in their fernleaf peonies. They are so lovely and would do really well in our climate.
I told Mike about the adventitious roots and will give him the partial list posted here along with your hood news. I have the same news for my Coral Sunset. Two scrawny roots that I potted up winter 2014-15 that survived, then planted outside, which then were puny and all but dead (looking). When fall came last year I dug them up thinking they were dead but they had growth (pips) so I put them in a better bed and both have come through with nice growth. So I guess that sort of proves the hypothesis that roots even without eyes can grow to plants.
I may try it on one of my other ones from the list or maybe just buy one to experiment on.