How to Prune Iris 'Blue King'?
Cut back old flower stems after flowering and remove dying foliage in autumn

Iris 'Blue King' · Iris 'Blue King'
Grow in any moist but not waterlogged, neutral to slightly acidic soil in full sun or partial shade. In drier soils, dig in well-rotted manure before planting and apply as a mulch each spring
Cut back old flower stems after flowering and remove dying foliage in autumn