Troubleshooting
Pink Calla Lily problems — and how to fix them
Pink Calla Lily (Zantedeschia rehmannii) 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.
Rhizome rot
Overwatering during or especially after the growing season causes rhizome rot. Ensure excellent drainage in containers and allow the rhizome to dry off completely during winter dormancy. In cold, wet climates, lift and store rhizomes frost-free.
Failure to flower
Insufficient sunlight, excessive nitrogen, or rhizomes planted too shallowly inhibit flowering. Plant rhizomes 5–8 cm deep, feed with high-potassium fertiliser, and ensure at least 4 hours of bright light daily.
Botrytis (grey mould)
In cool, damp, poorly ventilated conditions, Botrytis cinerea causes grey fuzzy mould on stems and spathes. Improve airflow, avoid overhead watering, and remove affected tissue promptly. Apply a copper-based fungicide if the problem persists.
Prevent pink calla lily problems before they start
Most pink calla lily issues are care-mismatch, not bad luck. Dial in the basics:
Pink Calla Lily problems — FAQ
Why is my pink calla lily rhizome rot?
Overwatering during or especially after the growing season causes rhizome rot. Ensure excellent drainage in containers and allow the rhizome to dry off completely during winter dormancy. In cold, wet climates, lift and store rhizomes frost-free.
Why is my pink calla lily failure to flower?
Insufficient sunlight, excessive nitrogen, or rhizomes planted too shallowly inhibit flowering. Plant rhizomes 5–8 cm deep, feed with high-potassium fertiliser, and ensure at least 4 hours of bright light daily.
Why is my pink calla lily botrytis (grey mould)?
In cool, damp, poorly ventilated conditions, Botrytis cinerea causes grey fuzzy mould on stems and spathes. Improve airflow, avoid overhead watering, and remove affected tissue promptly. Apply a copper-based fungicide if the problem persists.