Ostrich ferns

Question

Older ostrich fern crowns seem to push up out of the ground & I assume freeze over the winter. How do I prevent this from happening or do they have a life span?

Answer 1

If crowns lift themselves out of the soil, they should be replanted.

https://www.gardeningknowhow.com/ornamental/foliage/ferns/how-to-divide-fern-plants.htm