Troubleshooting
Pelargonium citronellum problems — and how to fix them
Pelargonium citronellum (Pelargonium citronellum) 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.
Tall and leggy
Its natural vigour makes it sprawl if unchecked; prune and pinch in spring to maintain a bushy, well-branched shape.
Mistaken pest-repellent claims
The 'mosquito plant' name overpromises; crushed leaves smell of citronella but the growing plant does not meaningfully repel mosquitoes. Manage expectations rather than relying on it.
Woody, bare base
Old plants lose lower leaves and turn woody; prune hard in early spring or restart from cuttings to rejuvenate.
Rust and grey mould
Damp, crowded conditions invite fungal disease. Improve spacing and airflow and remove infected foliage promptly.
Prevent pelargonium citronellum problems before they start
Most pelargonium citronellum issues are care-mismatch, not bad luck. Dial in the basics:
Looking for pelargonium citronellum in general rather than its problems? Read the full pelargonium citronellum care guide — light, water, soil and feeding.
Pelargonium citronellum problems — FAQ
Why is my pelargonium citronellum tall and leggy?
Its natural vigour makes it sprawl if unchecked; prune and pinch in spring to maintain a bushy, well-branched shape.
Why is my pelargonium citronellum mistaken pest-repellent claims?
The 'mosquito plant' name overpromises; crushed leaves smell of citronella but the growing plant does not meaningfully repel mosquitoes. Manage expectations rather than relying on it.
Why is my pelargonium citronellum woody, bare base?
Old plants lose lower leaves and turn woody; prune hard in early spring or restart from cuttings to rejuvenate.
Why is my pelargonium citronellum rust and grey mould?
Damp, crowded conditions invite fungal disease. Improve spacing and airflow and remove infected foliage promptly.