How to Prune Iris prismatica?
Remove spent flower stems after flowering, and any dying foliage in autumn

Iris prismatica · Iris prismatica
Thrives in moist, humus rich, ideally neutral to slightly acid soil. Will tolerate part shade but flowering is best in full sun. Suitable for planting at the edges of ponds and streams, in a bog garden, or in a border where the soil does not dry out
Remove spent flower stems after flowering, and any dying foliage in autumn