Polka Dot Begonia care guide
Begonia maculata · Begoniaceae
Polka Dot Begonia (Begonia maculata) is a terrarium plant. It belongs to the Begoniaceae family. It is native to South-east Brazil (Espírito Santo, Rio de Janeiro, São Paulo), in the Atlantic rainforest understorey. It needs good but filtered light for sturdy canes and bright spots; shade from hot sun, which scorches the leaves light. Water temperature: 15°C – 22°C. Care difficulty: Moderate. Growth rate: moderate.
How do you care for Polka Dot Begonia?
| Light | Good but filtered light for sturdy canes and bright spots; shade from hot sun, which scorches the leaves |
|---|---|
| CO₂ | High humidity (no figure in sources), but airflow is essential |
| Temperature | 15°C – 22°C |
| Placement | LARGE CLOSED or OPEN with ventilation – it grows well in big terrariums, but fungal problems mean it needs airflow and regular debris removal. NOT for small jars; only young plants fit, in a tall container, at the back. |
| Growth | Moderate |
| Difficulty | Moderate |
| Family | Begoniaceae |
How do you trim and propagate Polka Dot Begonia?
Cut over-long canes back to 2–3 buds in late spring. In a terrarium, remove fallen flowers and dead leaves promptly to prevent rot. Take 7–10 cm stem cuttings in spring, in sandy compost with bottom heat of 18–21°C.
What problems affect Polka Dot Begonia?
Powdery mildew or grey mould from stagnant, over-humid air; stem rot and collapse from overwatering (the main cause of losses); mealybugs, spider mites, thrips, whitefly, aphids.
How do you fix Polka Dot Begonia problems?
Increase air circulation and cut away affected parts. Keep moist but never waterlogged, letting the surface dry a little between waterings, less in winter; filtered or rain water is suggested. Light, free-draining, acidic to neutral compost. Liquid feed at alternate waterings while growing. Minimum about 10–15°C.
Where does Polka Dot Begonia come from?
South-east Brazil (Espírito Santo, Rio de Janeiro, São Paulo), in the Atlantic rainforest understorey
What should you know before buying Polka Dot Begonia?
TOXIC to cats, dogs and horses (ASPCA): soluble calcium oxalates cause vomiting and drooling, and the underground parts are the most toxic. RHS advises gloves and keeping it away from pets; the sap may irritate skin.
Sources
- Begonia maculata Raddi (GBIF backbone; distribution from WCVP/Kew) — GBIF / Kew World Checklist of Vascular Plants
- Begonia maculata - spotted begonia — Royal Horticultural Society
- Begonias as houseplants — Royal Horticultural Society
- Begonia - Cane Types — NC State Extension Gardener Plant Toolbox
- Polka Dot Begonia - Cane Types (Begonia maculata) — UF/IFAS Extension Santa Rosa County
- Begonia maculata — Wikipedia
- Large Terrarium Plants — Terrarium Tribe
- Begonia — ASPCA Animal Poison Control Center
Care details checked against these sources on 2026-09-23.
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