Troubleshooting
Histrioides Iris problems — and how to fix them
Histrioides Iris (Iris histrioides) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Ink spot disease (Drechslera iridis)
A fungal disease that causes black or dark brown lesions on the bulb scales and streaks on foliage; affected bulbs decline and eventually fail. Purchase certified disease-free stock, improve drainage, and avoid replanting iris in infected ground.
Slug and snail damage to emerging flowers
The very early flowers appear at ground level and are especially vulnerable to slug and snail damage, which can ruin the display overnight. Apply iron phosphate pellets or a physical barrier when shoots first appear in late winter.
Prevent histrioides iris problems before they start
Most histrioides iris issues are care-mismatch, not bad luck. Dial in the basics:
Histrioides Iris problems — FAQ
Why is my histrioides iris ink spot disease (drechslera iridis)?
A fungal disease that causes black or dark brown lesions on the bulb scales and streaks on foliage; affected bulbs decline and eventually fail. Purchase certified disease-free stock, improve drainage, and avoid replanting iris in infected ground.
Why is my histrioides iris slug and snail damage to emerging flowers?
The very early flowers appear at ground level and are especially vulnerable to slug and snail damage, which can ruin the display overnight. Apply iron phosphate pellets or a physical barrier when shoots first appear in late winter.