How to Prune variegated stinking iris?
Remove any dying foliage in autumn, old flower stems can be cut down after flowering

variegated stinking iris · Iris foetidissima 'Variegata'
Grow in well-drained, neutral to slightly acid loam but will tolerate most soils in full sun, partial shade or shade
Remove any dying foliage in autumn, old flower stems can be cut down after flowering