I am still new to peonies, but this year I notice a number of interesting things. If you have interesting things, I would love to have you add it now or later.

TP in a pot on the warmer porch bloomed sooner than the data base says.

Peonies planted in the ground later are later coming up, but we will see if they bloom on time.

Dwarf Iris are supposed to be about early peony bloom time, but they are 2 weeks earlier (this is typical weather this year.) Some noID ebay iris are blooming with my Abalone Pearl.

We are going to be done with freezes by the time peonies bloom here, I could have saved myself lots of "covering." We have cool nights even if we have warmish (70f) days and peonies last well at those temps.

I thought that I would never have peonies and roses blooming together, but I did not account for the micro-climate of pots close to the southwall of the house. I wonder if I will get landscape roses blooming with late peonies?

Finally my peony buds seemed to keep the thatching ants from eating my fruit tree blossoms, yet did not hurt my peonies...a couple of cheap peonies may make their way to the orchard.

My itohs in the front are having new shoots, that must mean they are growing. I didn't know that the leaves on the plants don't grow, unlike roses.

Good idea for a thread! This year a few of my itohs bloomed a full 2 weeks before the main group of herbaceous. I always thought itoh were generally last so i found it interesting.

Itohs bloom early for me as well here.
Tree peonies take forever. I'm so glad I got one flower otherwise I might not think I'll be able to grow them here.

Another observation today, in SoCal, the herbaceous peony doesn't have time in the ground too long before Spring, so it has the shortest period of time for the root to develop. For example, my AW was planted sometime in early Dec, by March 31 it already has a bud. This is why I notice peony plants in colder area are much bigger and bushier than mine.