How to Prune Japanese lace fern?
Remove dead fronds before new ones unfurl

Japanese lace fern · Polystichum polyblepharum
Also known as: tassel fern
Grow in fertile, humus-rich, well-drained soil in deep or partial shade; protect crowns from excessive winter wet and provide a mulch around the crown to prevent crown from drying out
Remove dead fronds before new ones unfurl