Light Requirements By Type on begonia
What's Happening
Begonia genus contains 1900+ species with fundamentally different light adaptations. Cane begonias (maculata, lucerna) evolved in dappled forest light requiring 2000-4000 lux. Rhizomatous types (rex, Escargot) are deep shade adapted thriving at 1000-2000 lux. Rex begonias have low chlorophyll density requiring higher light intensity (2500-3500 lux) but cannot tolerate direct sun. Tuberous begonias are photoperiod sensitive, requiring 12+ hours light for continuous bloom.
How to Fix It
- 1
Identify begonia type by growth habit: cane (upright stems), rhizomatous (horizontal stems), rex (colorful patterned leaves)
- 2
Cane begonias: Position in bright indirect light 2000-4000 lux (4-6 feet from south window)
- 3
Rhizomatous begonias: Provide 1000-2000 lux in north or filtered east window
- 4
Rex begonias: Use 2500-3500 lux with grow light supplementation 12-14 hours
- 5
Adjust gradually over 7-10 days when moving between light levels to avoid shock
How to Prevent It
Identify begonia type before placement. Cane types: East/west windows with sheer curtain. Rhizomatous: North or filtered east windows. Rex: Bright indirect with supplemental grow lights. Provide 12-14 hours daily using LED grow lights (6000-6500K) if natural light is insufficient. Monitor with light meter app.