Troubleshooting
Spanish Iris problems — and how to fix them
Spanish Iris (Iris xiphium) 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.
Bulb rot (Fusarium and bacterial)
Most common in waterlogged or humid summer soils. Lift bulbs after foliage dies, dry thoroughly, and store in a cool, airy place. Discard any soft, discoloured, or foul-smelling bulbs before replanting in autumn.
Ink disease (Drechslera iridis)
Fungal infection producing black crust-like lesions on bulb tunics and streaked, distorted foliage. No effective cure; remove and destroy affected bulbs. Avoid replanting in the same location for several years.
Aphid-borne iris mosaic virus
Causes mottled, streaked, or stunted foliage. Control aphid vectors with insecticidal soap or reflective mulch. Remove and destroy virus-infected plants; there is no cure for affected bulbs.
Prevent spanish iris problems before they start
Most spanish iris issues are care-mismatch, not bad luck. Dial in the basics:
Looking for spanish iris in general rather than its problems? Read the full spanish iris care guide — light, water, soil and feeding.
Spanish Iris problems — FAQ
Why is my spanish iris bulb rot (fusarium and bacterial)?
Most common in waterlogged or humid summer soils. Lift bulbs after foliage dies, dry thoroughly, and store in a cool, airy place. Discard any soft, discoloured, or foul-smelling bulbs before replanting in autumn.
Why is my spanish iris ink disease (drechslera iridis)?
Fungal infection producing black crust-like lesions on bulb tunics and streaked, distorted foliage. No effective cure; remove and destroy affected bulbs. Avoid replanting in the same location for several years.
Why is my spanish iris aphid-borne iris mosaic virus?
Causes mottled, streaked, or stunted foliage. Control aphid vectors with insecticidal soap or reflective mulch. Remove and destroy virus-infected plants; there is no cure for affected bulbs.