My peony has only produced 2 flowers in the last 2 years whereas it always had abundance of blossoms. Plant is about 15 years old.
Certified GKH Gardening Expert
There could be several reasons why it won't set bloom. They need as much light as you can give them, and an occasional feeding. Here is a link for more information: https://www.gardeningknowhow.com/ornamental/flowers/peony/why-your-peony-buds-but-never-flowers.htm