How to Prune white ginger lily?
No pruning required other than cutting back the foliage and old flower spikes at the end of the season

white ginger lily · Hedychium coronarium
Also known as: butterfly lily; fragrant garland flower; garland lily; Indian garland flower; white butterfly ginger lily; white ginger
Outdoors, grow in humus-rich, moist but well-drained soil in sun or partial shade. Shelter from cold winds and consider applying a deep mulch of garden compost or leafmould to protect the rhizomes in frost prone areas. In containers or under glass, use a loam-based compost such as John Innes No 3 and grow on in bright indirect light
No pruning required other than cutting back the foliage and old flower spikes at the end of the season