Troubleshooting
Pelargonium 'Wilhelm Langguth' problems — and how to fix them
Pelargonium 'Wilhelm Langguth' (Pelargonium 'Wilhelm Langguth') 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.
Geranium rust
Pelargonium rust shows as brown pustules ringed in yellow on leaf undersides. Remove affected leaves, improve airflow and avoid wetting foliage.
Oedema
Corky, blistered patches on leaves from overwatering in cool, dull conditions. Water less and increase light and ventilation.
Loss of variegation
Too little light mutes the white margins; relocate to full sun to restore contrast.
Whitefly
Frequent under glass; monitor leaf undersides and treat with insecticidal soap or Encarsia parasitic wasps.
Prevent pelargonium 'wilhelm langguth' problems before they start
Most pelargonium 'wilhelm langguth' issues are care-mismatch, not bad luck. Dial in the basics:
- What's wrong with my plant? — the diagnosis apps compared
- Pelargonium 'Wilhelm Langguth' watering schedule
- Pelargonium 'Wilhelm Langguth' light requirements
- Best soil mix for pelargonium 'wilhelm langguth'
- Pelargonium 'Wilhelm Langguth' temperature & humidity
- Full pelargonium 'wilhelm langguth' care guide
Looking for pelargonium 'wilhelm langguth' in general rather than its problems? Read the full pelargonium 'wilhelm langguth' care guide — light, water, soil and feeding.
Pelargonium 'Wilhelm Langguth' problems — FAQ
Why is my pelargonium 'wilhelm langguth' geranium rust?
Pelargonium rust shows as brown pustules ringed in yellow on leaf undersides. Remove affected leaves, improve airflow and avoid wetting foliage.
Why is my pelargonium 'wilhelm langguth' oedema?
Corky, blistered patches on leaves from overwatering in cool, dull conditions. Water less and increase light and ventilation.
Why is my pelargonium 'wilhelm langguth' loss of variegation?
Too little light mutes the white margins; relocate to full sun to restore contrast.
Why is my pelargonium 'wilhelm langguth' whitefly?
Frequent under glass; monitor leaf undersides and treat with insecticidal soap or Encarsia parasitic wasps.