How to Prune plantain lily 'Silvery Slugproof'?
No pruning required

plantain lily 'Silvery Slugproof' · Hosta 'Silvery Slugproof'
Grow in a shady spot in fertile soil that does not dry out, with shelter from cold, drying winds. Mulch annually in spring. Hostas in the ground may need watering during dry spells. See hosta cultivation for more detailed advice
No pruning required