Thank you, Ian, for the tour of your wonderful garden in the last bulb log, -as enjoyable and interesting as every Bulb Log. This one helped me identify a few tree peonies we have had in the garden for 10-12 years, they must be P. delavayi. One is quite tall, over 1 m (3-4 feet) with clear red flowers, like in your photo. The other two are only half that height, and have dark red flowers. Otherwise they are similar. Thanks for the clue. One of the P. lutea ludlowii seedlings you gave me last autumn survived this horror of a winter we had. It seems to be doing fine, in a pot now, inspite of being heaved more or less completely out of the ground by the frost.
Knud