How to Prune Lilium 'After Eight'?
No pruning required, but deadheading will improve their appearance

Lilium 'After Eight' · Lilium 'After Eight'
Plant bulbs in the autumn. Grow in well-drained soil enriched with leaf mould or well-rotted organic matter. Ideally, grow in full sun with the base of the plant in shade. Suitable for containers, see growing lilies for more advice
No pruning required, but deadheading will improve their appearance