How to Prune asphodel?
Although you can cut back flower stems after flowering the seedheads are attractive so can be left

asphodel · Asphodeline lutea
Also known as: flower of the dead; Jacob's rod; king's spear; yellow asphodel
Grow in moderately fertile, well-drained soil in full sun. Can die back in heavy, poorly-drained soil
Although you can cut back flower stems after flowering the seedheads are attractive so can be left