I like growing as many kinds of peonies as possible so I've grown them from seed as well as purchased many plants to get together a nice collection. I'm not even too concerned about the names anymore, but I am able to tell their age, and whether they are herbaceous, itoh or tree peonies just by their appearance. I'm only selecting no more than 7 of each type as it would be too long of a blog post to post hundreds of photos.
Here are some 1st year tree peonies which are just starting to come out this year. They usually make no more than 1-3 leaves on the 1st year while there has been a case where I've gotten 6 leaves before. These have just started coming out after a good week of rain and temperatures slightly above freezing.