Troubleshooting
Begonia 'Fireworks' problems — and how to fix them
Begonia 'Fireworks' (Begonia rex-cultorum 'Fireworks') 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.
Crispy brown leaf edges
Low humidity is the usual cause for Rex begonias. Raise ambient humidity with a pebble tray or humidifier and keep the soil evenly moist.
Powdery mildew
White powder from wet leaves and stagnant air. Water at the soil, improve ventilation, avoid misting, and remove infected leaves promptly.
Rhizome and root rot
From overwatering or burying the rhizome. Use a shallow pot and airy mix, keep the rhizome at the surface, and let the top of the soil dry between waterings.
Winter dormancy / leaf loss
Rex begonias often rest and drop leaves in winter. Reduce watering, keep warm and bright, and full growth returns in spring.
Prevent begonia 'fireworks' problems before they start
Most begonia 'fireworks' 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 'Fireworks' watering schedule
- Begonia 'Fireworks' light requirements
- Best soil mix for begonia 'fireworks'
- Begonia 'Fireworks' temperature & humidity
- Full begonia 'fireworks' care guide
Looking for begonia 'fireworks' in general rather than its problems? Read the full begonia 'fireworks' care guide — light, water, soil and feeding.
Begonia 'Fireworks' problems — FAQ
Why is my begonia 'fireworks' crispy brown leaf edges?
Low humidity is the usual cause for Rex begonias. Raise ambient humidity with a pebble tray or humidifier and keep the soil evenly moist.
Why is my begonia 'fireworks' powdery mildew?
White powder from wet leaves and stagnant air. Water at the soil, improve ventilation, avoid misting, and remove infected leaves promptly.
Why is my begonia 'fireworks' rhizome and root rot?
From overwatering or burying the rhizome. Use a shallow pot and airy mix, keep the rhizome at the surface, and let the top of the soil dry between waterings.
Why is my begonia 'fireworks' winter dormancy / leaf loss?
Rex begonias often rest and drop leaves in winter. Reduce watering, keep warm and bright, and full growth returns in spring.