How to Prune Chalcedonian lily?
Remove seed heads unless required and cut down stems once foliage dies down

Chalcedonian lily · Lilium chalcedonicum
Also known as: red martagon of Constantinople; scarlet martagon lily; scarlet Turk's cap lily
Grow in well-drained soil and best in partial shade; can be grown in a pot in a sheltered shady position, see growing lilies in containers for further information
Remove seed heads unless required and cut down stems once foliage dies down