I do think Tree Paeonies are difficult, especially if they've been moved. It may well take a while for them to settle and start flowering again. How annoying to lose a flower, though! Grrr..

Tree paeonies hate to be moved and if when you move then you don't plant them at exactly the same depth that they were before they can sulk for years! So you are just going to have to be patient :)

The flowers were huge....So they must have sulked. I think the level is the same as the soil leaves a mark.....I will have some Irises ....Tricky too......