How to Prune pendulous sedge?
Remove flower stems to prevent seeding. Cut out any dead foliage as it appears

pendulous sedge · Carex pendula
Also known as: great pendulous sedge
Grow in fertile, moist or wet soil in sun or partial shade. Will tolerate drier soils but will not grow as tall. Has the potential to become a nuisance if not managed well. For more information, see ornamental grasses cultivation
Remove flower stems to prevent seeding. Cut out any dead foliage as it appears