We're ALWAYS interested in seeing peony pictures, Valerie! I purchased High Fashion from Bannister's last year when they were having their retirement sale but have never heard of Yellow King. Is it an Itoh like Yellow Emperor?
As for the tree peony seeds, I purchased 3 packets from APS, absolutely nothing 1st spring. This spring I have babies from two of them! Think there was a total of 3 from 2 varieties, haven't looked in a while. Today is a clean up the garden and plant dahlias day, I'll try to take some pics of my seedlings to share. Hopefully I'll have my first herbaceous peony bloom to share today as well, Nova was 2/3 of the way open when I came in last night. Seeing slivers of color on several other buds but think it'll be at least another week or two.