Troubleshooting
Zantedeschia 'Schwarzwalder' problems — and how to fix them
Zantedeschia 'Schwarzwalder' (Zantedeschia 'Schwarzwalder') 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
Cold, waterlogged compost is the usual cause of loss; plant in free-draining mix, water moderately, and store dry through dormancy.
Dull spathe colour
Too little light prevents the spathes from reaching their darkest 'Black Forest' tone; give brighter indirect light or more sun.
Grey mould (botrytis)
Humid, still air and water on the spathes invite mould; improve airflow and water only at the base.
Spider mites
Dry indoor warmth brings stippling and webbing on leaves; increase humidity a little and treat promptly with insecticidal soap.
Prevent zantedeschia 'schwarzwalder' problems before they start
Most zantedeschia 'schwarzwalder' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for zantedeschia 'schwarzwalder' in general rather than its problems? Read the full zantedeschia 'schwarzwalder' care guide — light, water, soil and feeding.
Zantedeschia 'Schwarzwalder' problems — FAQ
Why is my zantedeschia 'schwarzwalder' rhizome rot?
Cold, waterlogged compost is the usual cause of loss; plant in free-draining mix, water moderately, and store dry through dormancy.
Why is my zantedeschia 'schwarzwalder' dull spathe colour?
Too little light prevents the spathes from reaching their darkest 'Black Forest' tone; give brighter indirect light or more sun.
Why is my zantedeschia 'schwarzwalder' grey mould (botrytis)?
Humid, still air and water on the spathes invite mould; improve airflow and water only at the base.
Why is my zantedeschia 'schwarzwalder' spider mites?
Dry indoor warmth brings stippling and webbing on leaves; increase humidity a little and treat promptly with insecticidal soap.