How to prune marsh fern

Late autumn after dieback, or early spring before new fronds unfurl. Cut all dead fronds to ground level with shears in late autumn or early spring. To manage spread, dig and sever rhizomes at the desired boundary in early spring before new growth emerges. New fronds need no cutting.

Annually in late autumn or spring; rhizome control as needed. Marsh Fern (Thelypteris palustris) is a deciduous fern that dies back to the ground in winter. Cut back all dead fronds in late autumn or early spring. In boggy or pond-margin settings it spreads by rhizomes, so rhizome management (rather than frond pruning) may occasionally be needed to control spread.

Cut all dead fronds to ground level with shears in late autumn or early spring. To manage spread, dig and sever rhizomes at the desired boundary in early spring before new growth emerges. New fronds need no cutting.