How to Prune Iris pallida subsp. cengialti?
Remove spent flower stems in summer, and any dying foliage in autumn

Iris pallida subsp. cengialti · Iris pallida subsp. cengialti
Thrives in a sunny position, in neutral to slightly acid soil with good drainage. Plant rhizomes just above soil level, as sun on the rhizomes encourages flowering. See bearded iris cultivation
Remove spent flower stems in summer, and any dying foliage in autumn