Troubleshooting
Hooded-leaf Pelargonium problems — and how to fix them
Hooded-leaf Pelargonium (Pelargonium cucullatum) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Pelargonium rust (Puccinia pelargonii-zonalis)
Yellow spots on upper leaf surfaces with rings of brown spores on the undersides; common in humid, poorly ventilated conditions. Remove affected leaves promptly, improve airflow, and avoid wetting foliage.
Blackleg stem rot
Blackening and collapse of the stem base caused by Pythium or Botrytis in waterlogged, cold compost. Use very free-draining mix, water sparingly especially in winter, and ensure frost-free conditions.
Prevent hooded-leaf pelargonium problems before they start
Most hooded-leaf pelargonium issues are care-mismatch, not bad luck. Dial in the basics:
Hooded-leaf Pelargonium problems — FAQ
Why is my hooded-leaf pelargonium pelargonium rust (puccinia pelargonii-zonalis)?
Yellow spots on upper leaf surfaces with rings of brown spores on the undersides; common in humid, poorly ventilated conditions. Remove affected leaves promptly, improve airflow, and avoid wetting foliage.
Why is my hooded-leaf pelargonium blackleg stem rot?
Blackening and collapse of the stem base caused by Pythium or Botrytis in waterlogged, cold compost. Use very free-draining mix, water sparingly especially in winter, and ensure frost-free conditions.