How to Prune lily 'Delicate Joy'?
No pruning required, but deadheading will improve their appearance

lily 'Delicate Joy' · Lilium 'Delicate Joy'
Plant bulbs in autumn, 15cm deep, in most but well-drained soil enriched with leaf mould or well-rotted organic matter, in a sheltered position, with the base of the plant in shade, for example from ground-cover plants, and the rest of the plant in full sun or light dappled shade; for more advice, see growing lilies in containers
No pruning required, but deadheading will improve their appearance