Troubleshooting
Iris 'Immortality' problems — and how to fix them
Iris 'Immortality' (Iris 'Immortality') 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
Overwatering or buried rhizomes cause mushy, smelly rot. Plant shallowly in free-draining soil and excise affected tissue at once.
Failure to rebloom
Cold climates, shade, crowding or under-feeding prevent the second flush. Site in full sun, feed through summer and divide regularly to encourage rebloom.
Iris leaf spot
Fungal spotting in wet weather disfigures foliage; remove infected leaves and tidy debris in autumn to reduce reinfection.
Iris borer
Larvae bore into rhizomes and trigger rot, mainly in North America. Clear old leaves in autumn and destroy infested rhizomes.
Prevent iris 'immortality' problems before they start
Most iris 'immortality' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for the species overview? Iris — the full care guide.
Iris 'Immortality' problems — FAQ
Why is my iris 'immortality' bacterial soft rot?
Overwatering or buried rhizomes cause mushy, smelly rot. Plant shallowly in free-draining soil and excise affected tissue at once.
Why is my iris 'immortality' failure to rebloom?
Cold climates, shade, crowding or under-feeding prevent the second flush. Site in full sun, feed through summer and divide regularly to encourage rebloom.
Why is my iris 'immortality' iris leaf spot?
Fungal spotting in wet weather disfigures foliage; remove infected leaves and tidy debris in autumn to reduce reinfection.
Why is my iris 'immortality' iris borer?
Larvae bore into rhizomes and trigger rot, mainly in North America. Clear old leaves in autumn and destroy infested rhizomes.