How to Prune Manipur lily?
Deadhead after flowering. Cut back stems when foliage dies down

Manipur lily · Lilium mackliniae
This is a stem-rooting species; plant at a depth of at least three times the height of the bulb. Grow in humus rich, well-drained soils improved with leaf mould or well-rotted organic matter, prefers light shade but will tolerate full sun
Deadhead after flowering. Cut back stems when foliage dies down