Troubleshooting
Begonia 'Passing Storm' problems — and how to fix them
Begonia 'Passing Storm' (Begonia rex-cultorum 'Passing Storm') 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.
Powdery mildew
Rex begonias are highly prone to it in still, humid air. Ensure good airflow, keep leaves dry, and remove affected foliage at the first white patches.
Winter leaf loss
Many Rex begonias drop leaves and go semi-dormant in winter. Reduce watering and stop feeding; new growth resumes from the rhizome in spring.
Crispy brown edges
Caused by low humidity or dry heat. Raise humidity with a tray or humidifier and keep the plant away from radiators and cold drafts.
Rhizome rot
Overwatering or burying the rhizome leads to soft, mushy rot. Keep the rhizome at the surface and let the soil dry slightly between waterings.
Prevent begonia 'passing storm' problems before they start
Most begonia 'passing storm' issues are care-mismatch, not bad luck. Dial in the basics:
- Common rex begonia problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Begonia 'Passing Storm' watering schedule
- Begonia 'Passing Storm' light requirements
- Best soil mix for begonia 'passing storm'
- Begonia 'Passing Storm' temperature & humidity
- Full begonia 'passing storm' care guide
Looking for the species overview? Begonia — the full care guide.
Begonia 'Passing Storm' problems — FAQ
Why is my begonia 'passing storm' powdery mildew?
Rex begonias are highly prone to it in still, humid air. Ensure good airflow, keep leaves dry, and remove affected foliage at the first white patches.
Why is my begonia 'passing storm' winter leaf loss?
Many Rex begonias drop leaves and go semi-dormant in winter. Reduce watering and stop feeding; new growth resumes from the rhizome in spring.
Why is my begonia 'passing storm' crispy brown edges?
Caused by low humidity or dry heat. Raise humidity with a tray or humidifier and keep the plant away from radiators and cold drafts.
Why is my begonia 'passing storm' rhizome rot?
Overwatering or burying the rhizome leads to soft, mushy rot. Keep the rhizome at the surface and let the soil dry slightly between waterings.