Troubleshooting
Tessellated Colchicum problems — and how to fix them
Tessellated Colchicum (Colchicum agrippinum) 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.
Corm rot
Caused by Fusarium or excess winter moisture; ensure sharp drainage and avoid planting in low-lying areas or heavy clay where water pools around the corm.
Failure to flower (blind corms)
Results from inadequate summer baking (too much shade or irrigation during dormancy) or planting corms too shallow — position the top of the corm 8–10 cm below the soil surface in full sun.
Slug and snail damage
Emerging flower stems and spring foliage are vulnerable to slug damage; apply a wildlife-friendly slug deterrent (copper rings or wool pellets) around established clumps in early autumn and again in late winter.
Prevent tessellated colchicum problems before they start
Most tessellated colchicum issues are care-mismatch, not bad luck. Dial in the basics:
Tessellated Colchicum problems — FAQ
Why is my tessellated colchicum corm rot?
Caused by Fusarium or excess winter moisture; ensure sharp drainage and avoid planting in low-lying areas or heavy clay where water pools around the corm.
Why is my tessellated colchicum failure to flower (blind corms)?
Results from inadequate summer baking (too much shade or irrigation during dormancy) or planting corms too shallow — position the top of the corm 8–10 cm below the soil surface in full sun.
Why is my tessellated colchicum slug and snail damage?
Emerging flower stems and spring foliage are vulnerable to slug damage; apply a wildlife-friendly slug deterrent (copper rings or wool pellets) around established clumps in early autumn and again in late winter.