How to Prune sword lily 'Prima Verde'?
No pruning required other than removing old fronds and deadheading flowers to tidy

sword lily 'Prima Verde' · Gladiolus 'Prima Verde'
Plant 10 to 16cm deep in fertile, well-drained soil preferably in full sun. 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 other than removing old fronds and deadheading flowers to tidy