How to Prune butterfly sword lily?
No pruning required

butterfly sword lily · Gladiolus papilio
Plant 10 to 16cm deep on a bed of sharp sand in fertile, well-drained soil. Lift when foliage dies back, discard old corms and store new corms in a dry frost-free place until planting in the spring. In milder areas a thick dry winter mulch may suffice
No pruning required