Aloe Vera Sunburn — White or Brown Patches from Too Much Sun Too Fast
Aloe Vera (Aloe vera)
Symptoms
- white or pale tan patches on leaf surfaces
- patches appearing on the sun-facing side of leaves
- patches developing after moving to brighter location
- patches that don't spread but turn increasingly dry
Causes
Sudden exposure to intense light
Aloe vera that has been living in indoor conditions (even a bright window) has chloroplasts acclimated to that specific light intensity. Moving the plant directly into full outdoor sun — even though Aloe vera is designed for desert sun — overloads the photosynthetic machinery. The chloroplasts bleach, the cells in the overloaded areas die, and white or tan patches form on the sun-facing leaf surfaces. This is photobleaching and photo-oxidative stress.
How to Fix It
- 1
Move the plant to a slightly shadier location — dappled shade or very bright filtered light while it acclimates.
- 2
The sunburned patches will not recover — those cells are dead. The patches are cosmetic and won't spread unless the burn continues. Don't remove the affected leaves unless they're cosmetically intolerable.
- 3
To acclimate to full sun: start in shade; after 5–7 days, move to morning sun only (east exposure); after another 5–7 days, move to morning-and-afternoon sun; then full sun. The gradual increase allows the chloroplasts to upregulate their protective mechanisms.
- 4
Once acclimated, the same intensity of light that caused burn no longer damages the plant. Fully acclimated Aloe vera in full sun rarely burns.
Prevention
- Acclimate any transition from indoor to outdoor light over 2–3 weeks
- Start outdoor placement in shaded or filtered sun position
- Never move directly from a dim room to full direct sun
Quick Summary
| Plant | Aloe Vera (Aloe vera) |
|---|---|
| Category | Light |
| Likely causes | Sudden exposure to intense light |
| Fix steps | 4 steps — see above |