Troubleshooting
Netted Iris problems — and how to fix them
Netted Iris (Iris reticulata) 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.
Ink disease (Drechslera iridis)
A fungal disease causing black blotches on bulbs and rotted, streaked foliage. Most prevalent in wetter soils. Discard infected bulbs; plant only in sharply drained gritty soil. No chemical cure; prevention is key.
Failure to rebloom
Bulbs often dwindle after 1–2 seasons in heavy or wet soils, or where summers are cool and damp. Lift after foliage dies back, dry in a warm spot, and replant in autumn in improved drainage or treat as annuals.
Slugs and snails
Emerging shoots and buds are vulnerable in late winter when slugs are active. Apply copper tape around container plantings or use iron phosphate pellets around bed plantings.
Prevent netted iris problems before they start
Most netted iris issues are care-mismatch, not bad luck. Dial in the basics:
Looking for netted iris in general rather than its problems? Read the full netted iris care guide — light, water, soil and feeding.
Netted Iris problems — FAQ
Why is my netted iris ink disease (drechslera iridis)?
A fungal disease causing black blotches on bulbs and rotted, streaked foliage. Most prevalent in wetter soils. Discard infected bulbs; plant only in sharply drained gritty soil. No chemical cure; prevention is key.
Why is my netted iris failure to rebloom?
Bulbs often dwindle after 1–2 seasons in heavy or wet soils, or where summers are cool and damp. Lift after foliage dies back, dry in a warm spot, and replant in autumn in improved drainage or treat as annuals.
Why is my netted iris slugs and snails?
Emerging shoots and buds are vulnerable in late winter when slugs are active. Apply copper tape around container plantings or use iron phosphate pellets around bed plantings.