Brittle Bladder Fern Cystopteris fragilis

The brittle bladder fern or fragile fern is a rhizomatous, herbaceous perennial fern in the spleenwort family (Aspleniaceae). It has a cosmopolitan distribution in temperate areas of all continents except Australia. It occurs naturally in North Carolina. The name of the genus comes from the Greek words kystis, meaning “bladder,” and pteris, a fern. The name highlights the indusium, which is inflated when young. The specific epithet is Latin for “fragile.” 

It is easy to grow, preferring alkaline to neutral soil and moist environments. It spreads slowly via a compact rhizome and grows in dappled to partial to full shade. It can go dormant in dry sites but recovers well once moisture returns to the soil. It is occasionally found in wetlands. It grows about a foot high, spreads 1 to 2 feet wide and has a clumping form.

The brittle bladder fern can be grown in native or shade gardens with attention to its moisture needs. It can also be grown in shallow water gardens or moist crevices. It is attractive against moist rocky areas.

Insects, Diseases, and Other Plant Problems:  

No serious insect or disease problems. Watch for Florida Fern Caterpillar.

VIDEO Created by NC State Extension's Homegrown series featuring Mark Weathington, Director of JC Raulston Arboretum.