Q.Do Peonies Grow On The Coast
Do peonies grow in salty strong winds

Certified GKH Gardening Expert
They are native to the European coasts so they should be fine. You would want to plant them in a protected area to avoid the strong winds.
https://www.gardeningknowhow.com/ornamental/flowers/peony/peony-care.htm
https://www.gardeningknowhow.com/ornamental/flowers/peony/peony-chill-hours.htm
https://www.gardeningknowhow.com/special/seaside/best-seaside-plants.htm
https://www.gardeningknowhow.com/special/seaside/catch-the-wave-with-seaside-gardening.htm