Troubleshooting
Roxburgh's Begonia problems — and how to fix them
Roxburgh's Begonia (Begonia roxburghii) 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.
Stem rot in waterlogged compost
The stout, slightly woody stems rot at the base when compost stays too wet, particularly in winter during the plant's natural cool, drier rest period. Ensure excellent drainage, reduce watering frequency in cool months, and use a free-draining mix.
Powdery mildew on tall stems
The upright, densely leafed stems can develop powdery mildew in poor air circulation. Water at soil level, remove affected leaves, and improve ventilation; placing the plant in a position with gentle air movement helps prevent recurrence.
Mealybugs in leaf axils
Mealybugs colonise the junction between leaf stalk and stem, where they are protected by the leaf base. Inspect regularly along the stem, treat with insecticidal soap or a cotton bud dipped in rubbing alcohol, and isolate affected plants to prevent spread to nearby specimens.
Prevent roxburgh's begonia problems before they start
Most roxburgh's begonia issues are care-mismatch, not bad luck. Dial in the basics:
Roxburgh's Begonia problems — FAQ
Why is my roxburgh's begonia stem rot in waterlogged compost?
The stout, slightly woody stems rot at the base when compost stays too wet, particularly in winter during the plant's natural cool, drier rest period. Ensure excellent drainage, reduce watering frequency in cool months, and use a free-draining mix.
Why is my roxburgh's begonia powdery mildew on tall stems?
The upright, densely leafed stems can develop powdery mildew in poor air circulation. Water at soil level, remove affected leaves, and improve ventilation; placing the plant in a position with gentle air movement helps prevent recurrence.
Why is my roxburgh's begonia mealybugs in leaf axils?
Mealybugs colonise the junction between leaf stalk and stem, where they are protected by the leaf base. Inspect regularly along the stem, treat with insecticidal soap or a cotton bud dipped in rubbing alcohol, and isolate affected plants to prevent spread to nearby specimens.