How to Prune black iris?
Remove any dying foliage in autumn, old flower stems can be cut down after flowering. Tall varieties can have their leaf fans trimmed to one third of the total height to reduce wind rock while the plants are establishing
black iris · Pruning
black iris · Iris chrysographes [Black-flowered]
Grow in well-drained, neutral to slightly acid loam in full sun or partial shade. Mulch in spring
Watering: Water moderately, let surface dry slightly between irrigationsSunlight: Full sun · Partial shadeHarmful if eaten. Wear gloves and other protective equipment when handling