Troubleshooting
Iris 'Benton Susan' problems — and how to fix them
Iris 'Benton Susan' (Iris 'Benton Susan') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Bacterial soft rot
Mushy, foul-smelling rhizomes from overly wet or poorly drained soil. Cut out affected tissue, expose rhizomes to sun, and improve drainage.
Iris leaf spot
Brown spots with yellow halos on foliage in damp weather. Remove infected leaves, improve air flow, and avoid wetting foliage.
Few or no flowers
Usually from too much shade, overcrowded clumps, rhizomes buried too deep, or excess nitrogen. Divide every 3-4 years and replant rhizomes near the surface in full sun.
Iris borer
Caterpillars tunnel through leaves into rhizomes, opening the door to rot. Remove old foliage in autumn and destroy affected rhizomes.
Prevent iris 'benton susan' problems before they start
Most iris 'benton susan' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for the species overview? Iris — the full care guide.
Iris 'Benton Susan' problems — FAQ
Why is my iris 'benton susan' bacterial soft rot?
Mushy, foul-smelling rhizomes from overly wet or poorly drained soil. Cut out affected tissue, expose rhizomes to sun, and improve drainage.
Why is my iris 'benton susan' iris leaf spot?
Brown spots with yellow halos on foliage in damp weather. Remove infected leaves, improve air flow, and avoid wetting foliage.
Why is my iris 'benton susan' few or no flowers?
Usually from too much shade, overcrowded clumps, rhizomes buried too deep, or excess nitrogen. Divide every 3-4 years and replant rhizomes near the surface in full sun.
Why is my iris 'benton susan' iris borer?
Caterpillars tunnel through leaves into rhizomes, opening the door to rot. Remove old foliage in autumn and destroy affected rhizomes.