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Great, now I know, that my Paeonia obovata is subsp. willmottiae, thanks to Matt and Leena!
Thomas, does your P.obovata subsp willmottiae set good seeds?My normal pink P.obovata sets masses of seeds, but most of the seeds of P.obovata subsp willmottiae are not good (red), or only very small and flat black seeds. My plant was planted in 2006 and only twice I have gotten couple of good fat seeds, and even they have never germinated. I have now again three seeds from last year which developed roots in the early winter, they have not yet come up after the cold period. I hope they will germinate, but I'm not surprised if they don't.It is a puzzle to me why this peony doesn't set seeds like the normal P.obovata or other species!It flowers here about 10 days later than P.obovata, and there are no frosts at that time usually, and I have many other peonies flowering (P.anomala, P.veitchii, P.officinalis and early hybrids) at the same time.
I have one P.ruprechtiana, two year old seedling which I planted outside last autumn. I got some seeds from a Finnish friend who was working in Scotland for a year few years ago and is a member of SRGC, and she had bought the seeds from one of the events (she told me about SRGC and this forum So this is all I know of it's origin. Here is a picture of it last year, it doesn't seem any bigger yet.