Troubleshooting
Zantedeschia 'Black Star' problems — and how to fix them
Zantedeschia 'Black Star' (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.
Rhizome rot
Soggy or cold compost rots the rhizome; use free-draining mix, avoid overwatering, and store dry during dormancy.
Faded spathe colour
Insufficient light dulls the signature near-black tone; give brighter indirect light or more sun for the deepest colour.
Botrytis (grey mould)
Water sitting on spathes and crowded, humid conditions invite grey mould; improve airflow and water at the base only.
Spider mites
Hot, dry indoor air encourages fine webbing and stippled leaves; raise humidity slightly and treat early with insecticidal soap or a miticide.
Prevent zantedeschia 'black star' problems before they start
Most zantedeschia 'black star' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for zantedeschia 'black star' in general rather than its problems? Read the full zantedeschia 'black star' care guide — light, water, soil and feeding.
Zantedeschia 'Black Star' problems — FAQ
Why is my zantedeschia 'black star' rhizome rot?
Soggy or cold compost rots the rhizome; use free-draining mix, avoid overwatering, and store dry during dormancy.
Why is my zantedeschia 'black star' faded spathe colour?
Insufficient light dulls the signature near-black tone; give brighter indirect light or more sun for the deepest colour.
Why is my zantedeschia 'black star' botrytis (grey mould)?
Water sitting on spathes and crowded, humid conditions invite grey mould; improve airflow and water at the base only.
Why is my zantedeschia 'black star' spider mites?
Hot, dry indoor air encourages fine webbing and stippled leaves; raise humidity slightly and treat early with insecticidal soap or a miticide.