How to Prune plantain lily 'Gold Edger'?
No pruning required

plantain lily 'Gold Edger' · Hosta 'Gold Edger'
Grow in a lightly shady spot, leaf colour will be more green in deeper shade. Needs fertile soil that does not dry out, and 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