Sunburn on calathea
What's Happening
Calathea leaves burn when exposed to direct sunlight, particularly intense afternoon sun. Unlike succulents with thick cuticles, Calathea have thin leaves adapted to forest understory. Direct sun causes photooxidative damage where reactive oxygen species destroy chloroplasts and cell membranes. Symptoms appear as bleached, papery patches or brown crispy spots where cells died. Damage occurs within hours and is irreversible. South and west windows are most dangerous without sheer curtains.
How to Fix It
- 1
Move immediately to location with bright indirect light only
- 2
Trim damaged leaf areas with sterile scissors to prevent spread
- 3
Install sheer curtains to filter direct sun if relocation impossible
- 4
Rotate plant weekly to ensure even light exposure
- 5
Monitor new growth - should emerge without damage if light is correct
What You'll Need
How to Prevent It
Position 3-6 feet from windows or use east/north exposures. Use light meter app to verify 200-400 foot-candles maximum. Never place in direct sun, even morning sun for extended periods. Sheer curtains are mandatory for south/west windows.