How to Prune Katherine blood lily?
No pruning required other than removing the faded leaves.

Katherine blood lily · Scadoxus multiflorus subsp. katherinae
Grow in a well drained, loam-based compost (JI No2) in full sun with some protection from very hot sun. Water freely when in active growth and gradually withhold water as the leaves fade for the winter.
No pruning required other than removing the faded leaves.