Should come back but no harm in putting this into the ground as well. Chop of the leaves so it can spend energy developing roots if that piece is viable.

Depends on if enough of the root crown was left behind for that section still in the ground to sprout again next year - I wouldn't bother putting what is shown in the photo back in the ground, in the hope that it will remain viable until new roots are produced this fall.

And plants are integrated systems, just as we are - cutting one part off results in less energy being available for the rest of the plant, and not the other way around. For instance with an herbaceous perennial such as this peony the leaves make food which is stored in the roots until spring, when this stored energy is used to grown new leaves.

Depending on what type of peony it is there may be enough crown tissue for it to develop additional roots. I would cut the tops off and bury the top in an out of the way place about three inches below the ground surface simply out of curiosity. Planting the recommended 2 inches the ground tends to dry during summers. I have related before that in my dump I used to toss pieces of roots from a peony group plant sale prep where I collected the bits and pieces without eyes to fill in a low area. It took a while but I did have new plants developed. Some, especially the corals, have the ability to develop eyes from blind roots. You have the advantage that you have part of a crown and crowns can develop both eyes and roots but you must have patience, an out of the way place that it will not be disturbed, and willingness to experiment.

"And plants are integrated systems, just as we are - cutting one part off results in less energy being available for the rest of the plant, and not the other way around. For instance with an herbaceous perennial such as this peony the leaves make food which is stored in the roots until spring, when this stored energy is used to grown new leaves." The leaves on the broken part aren't going to be making any more food, without the supporting thin roots that help absorb water and nutrients from soil, they will wilt and dry or potentially rot taking the stem down with them. On the other hand, if the leaves are chopped off, the thick storage roots would attempt to regenerate sending out shoots and roots as they would when planted as bare roots. Ah the condension of the learned....

Condescension*

I have yet to figure it out in the app on Android. I am posting this comment so I can check how the edit shows up. I was using it on browser earlier (on phone) and the keyboard was essentially getting hijacked by some sort of a virus, it would not register the autosuggestion when clicked, duplicate each word (without space).... Eventually I gave up and downloaded the app. Here's what the keyboard looks like when in a browser typing on a Houzz forum,, notice the hat and the eyes shadow on the keyboard:

I can't see any edit option

Post again with something then immediately look to the top right near that little flag. One the post I made earlier mentioning the edit the word still shows along with the word delete. Not certain with as much time as has passed if I can still edit or delete.

Trying again to see the edit link