Troubleshooting
Begonia 'Northern Lights' problems — and how to fix them
Begonia 'Northern Lights' (Begonia rex-cultorum 'Northern Lights') 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 readily develop white powdery patches in stagnant humid air. Improve ventilation, keep leaves dry, and remove infected leaves early.
Faded leaf color
Light that is too direct bleaches the silver-pink tones, while too little light mutes them. Aim for bright, filtered indirect light.
Winter dormancy leaf drop
Leaf loss in winter is often natural semi-dormancy, not death. Reduce watering, stop feeding, and wait for fresh growth in spring.
Rhizome rot
Soft, mushy rhizome and collapsing leaves point to overwatering. Keep the rhizome above the soil surface and let the mix dry slightly between waterings.
Prevent begonia 'northern lights' problems before they start
Most begonia 'northern lights' 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 'Northern Lights' watering schedule
- Begonia 'Northern Lights' light requirements
- Best soil mix for begonia 'northern lights'
- Begonia 'Northern Lights' temperature & humidity
- Full begonia 'northern lights' care guide
Looking for the species overview? Begonia — the full care guide.
Begonia 'Northern Lights' problems — FAQ
Why is my begonia 'northern lights' powdery mildew?
Rex begonias readily develop white powdery patches in stagnant humid air. Improve ventilation, keep leaves dry, and remove infected leaves early.
Why is my begonia 'northern lights' faded leaf color?
Light that is too direct bleaches the silver-pink tones, while too little light mutes them. Aim for bright, filtered indirect light.
Why is my begonia 'northern lights' winter dormancy leaf drop?
Leaf loss in winter is often natural semi-dormancy, not death. Reduce watering, stop feeding, and wait for fresh growth in spring.
Why is my begonia 'northern lights' rhizome rot?
Soft, mushy rhizome and collapsing leaves point to overwatering. Keep the rhizome above the soil surface and let the mix dry slightly between waterings.