Troubleshooting
Rosy Gladiolus problems — and how to fix them
Rosy Gladiolus (Gladiolus imbricatus) 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.
Thrips
Western flower thrips cause silvery streaking on leaves and petals. Treat with pyrethrin-based spray or neem oil at first sign of damage; control weed hosts nearby.
Fusarium corm rot
Brown decay at the base of corms. Ensure good drainage, avoid overwatering, and rotate planting positions yearly.
Botrytis (grey mould)
Favoured by cool, wet conditions. Remove affected flowers and foliage promptly; improve airflow between plants.
Aphids
Colonies cluster on flower spikes and young growth. Dislodge with a jet of water or use insecticidal soap spray.
Corm storage rot
When lifting for winter, allow corms to dry thoroughly before storing in cool, dry, frost-free conditions. Discard any soft or discoloured corms.
Prevent rosy gladiolus problems before they start
Most rosy gladiolus issues are care-mismatch, not bad luck. Dial in the basics:
Rosy Gladiolus problems — FAQ
Why is my rosy gladiolus thrips?
Western flower thrips cause silvery streaking on leaves and petals. Treat with pyrethrin-based spray or neem oil at first sign of damage; control weed hosts nearby.
Why is my rosy gladiolus fusarium corm rot?
Brown decay at the base of corms. Ensure good drainage, avoid overwatering, and rotate planting positions yearly.
Why is my rosy gladiolus botrytis (grey mould)?
Favoured by cool, wet conditions. Remove affected flowers and foliage promptly; improve airflow between plants.
Why is my rosy gladiolus aphids?
Colonies cluster on flower spikes and young growth. Dislodge with a jet of water or use insecticidal soap spray.
Why is my rosy gladiolus corm storage rot?
When lifting for winter, allow corms to dry thoroughly before storing in cool, dry, frost-free conditions. Discard any soft or discoloured corms.