Troubleshooting
Black Calla Lily problems — and how to fix them
Black Calla Lily (Zantedeschia 'Black Star') 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.
Fading spathe colour
The deep black-maroon pigmentation fades in insufficient light or heat. Ensure at least 6 hours of bright light and do not position in cool, shaded spots. High-potassium feeding also helps sustain colour intensity.
Rhizome rot in storage
If rhizomes are stored damp or cold (below 5°C/41°F), they rot over winter. After drying off, store in paper bags filled with dry vermiculite or coir at 10–15°C. Check monthly and discard any soft, discoloured rhizomes.
Aphids on new growth
Aphids cluster on emerging shoots and flower buds in spring. Blast off with a strong jet of water, or apply insecticidal soap. Ants tending aphid colonies on outdoor plants indicate an infestation — use a sticky barrier on pot legs.
Prevent black calla lily problems before they start
Most black calla lily issues are care-mismatch, not bad luck. Dial in the basics:
Black Calla Lily problems — FAQ
Why is my black calla lily fading spathe colour?
The deep black-maroon pigmentation fades in insufficient light or heat. Ensure at least 6 hours of bright light and do not position in cool, shaded spots. High-potassium feeding also helps sustain colour intensity.
Why is my black calla lily rhizome rot in storage?
If rhizomes are stored damp or cold (below 5°C/41°F), they rot over winter. After drying off, store in paper bags filled with dry vermiculite or coir at 10–15°C. Check monthly and discard any soft, discoloured rhizomes.
Why is my black calla lily aphids on new growth?
Aphids cluster on emerging shoots and flower buds in spring. Blast off with a strong jet of water, or apply insecticidal soap. Ants tending aphid colonies on outdoor plants indicate an infestation — use a sticky barrier on pot legs.