How to Prune plantain lily 'Snow Cap'?
No pruning required

plantain lily 'Snow Cap' · Hosta 'Snow Cap'
Grow in fertile soil that does not dry out, in a shady spot away from direct sun and 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