I moved two tree peonies last year at about this time. A free tree peony is too good to pass up They came from a garden belonging to the mother of a friend of mine. My friend got two tree peonies as well.....and there were still four left!!!The smaller one came through the winter really well, the larger(4 foot) one had some die off. This was at least in part due to the early thaw we had this spring, as it was doing all right until then.I only move peonies in the fall.....unless of course the demolition site bulldozer is advancing. Also, I bought one of Gardenimports sale priced herbacious peonies last fall....it didn't arrive until early November and it still produced one bloom for me this summer.Tree peonies are supposed to have the same planting preferences as herbaceaus peonies....or so the multitude of internet sites that I consulted before I put shovel to the ground to obtain my tree peonies last year.Good luck whenever you move it.

Thank you for answering my question. I thought that this would be the answer, but I wanted to make certain, since I had already moved it in the spring. I will definitely move it again this coming week. It is an amazing pastel yellow colour which will stand out beautifully at the front of the house. I have a fairly large red flower tree peony at the front also, but alas, it doesn't show up well against the red brick.

Once again, thanks for your input.