What happened to my peony

I had a herbaceous peony but last year it didn't grow at all. It wasn't moved or mulched, I am aware that peony don't like to be planted to deep. It's been in the same spot for a few years. During summer I thought I'd dig around this area to see but there was nothing there. Is this normal? Also can peony roots be split to create more plants?
Thanks a million
Thanks a million
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We have had some very odd weather conditions in the last year. Winter began mild, to be followed by the Beast from the East. After that summer quickly became unusually hot and dry. It did for many of my plants and perhaps your peony, too.
Yes, a strong, healthy peony can be split. I believe this is the best time to do it - experts will correct me if it isn't - but I once had to rescue one in full flower, when my in-laws decided on some garden improvements, and it fell into many pieces as I dug it up. I thought I would lose the whole lot but, in fact, every single piece survived and flowered again the next year.