Sunburn on aloe vera
What's Happening
Sunburn in Aloe vera manifests as bleached, tan, or brown necrotic patches on leaf surfaces exposed to intense light. Unlike desert-adapted cacti with thick waxy cuticles, Aloe vera develops protective anthocyanins and epicuticular waxes gradually over 2-4 weeks. When plants acclimated to indoor low-light conditions (500-1000 lux) experience sudden exposure to direct outdoor sunlight (10,000+ lux), UV radiation penetrates unprotected leaf cells causing photoxidative damage. The central rosette typically recovers while outer burned leaves remain damaged permanently. Reddish 'protective tan' coloration during acclimation is normal; white/bleached tissue indicates severe necrosis.
How to Fix It
- 1
Trim damaged tissue: Remove severely burned leaves at base with sterile scissors to redirect energy to apical meristem regeneration
- 2
Gradual acclimation protocol: Start with 1-2 hours of morning direct sun (before 10am); increase exposure by 30 minutes every 3-4 days over 2-3 weeks
- 3
Provide protective shade: During heatwaves (above 35°C/95°F), use 50-70% shade cloth to filter intense midday sun
- 4
Relocate to appropriate light: Position in bright indirect light indoors (2000-4000 lux) or dappled outdoor shade until full acclimation completes
- 5
Allow recovery period: Withhold fertilization for 6-8 weeks; maintain consistent watering schedule—do not overwater in response to stress
What You'll Need
How to Prevent It
Acclimate gradually over 14-21 days when moving from low to high light environments. Never place indoor aloes directly into full outdoor sun. Monitor light intensity with meter: maintain 2000-5000 lux for optimal growth without burn risk. Use sheer curtains on south-facing windows to diffuse intense afternoon sun.