Top extending the season is why I looked into tree peonies, but the 2 or 3 that I really want seem to overlap the corals as far as I can tell. This bloom time seems so hard to understand. I think it is location specific, not really type, but maybe it was the original root stock. I tried listing and buying based on bloom time, but so many websites conflicted and I am not sure why.
I have one late peony coming and I am looking for a red tree peony as I read they are the earliest, but I also got Little Scout which Adelman's says is their earliest.
I did decide that I like bright colors in spring and red, coral, yellow are what I want. I would get a yellow tree peony if it was earlier than the coral, but I just can't tell.