How to Prune montbretia 'Hellfire'?
No pruning required, except the removal of dead leaves and flower stems before new growth starts in spring.

montbretia 'Hellfire' · Crocosmia 'Hellfire'
Corms should be planted in moderately fertile, humus rich soil approximately 10cm deep and 7.5–10cm apart in groups to form clumps. Water if it is a dry season as a lack of water reduces flowering. Has the potential to become a nuisance in some gardens if not managed well.
No pruning required, except the removal of dead leaves and flower stems before new growth starts in spring.