How to Prune plantain lily 'Pandora's Box'?
Remove spent foliage as required and clear up dead foliage when it dies back at the end of the growing season

plantain lily 'Pandora's Box' · Hosta 'Pandora's Box'
Grow in fertile, moist well-drained soil in part or full shade, shelter from cold winds. See hosta cultivation
Remove spent foliage as required and clear up dead foliage when it dies back at the end of the growing season