Sunburn / Sun Scald

About this condition

A condition in which leaf tissue is damaged by sudden intense light or direct sun under high temperatures, causing discoloration and cell death — often triggered by abrupt movement from indoors to outdoors.

Common symptoms

White, cream, or brown discoloration appears on the sun-facing side of leaves
Affected areas dry out, becoming sunken or papery
Discolored patches are permanent and do not recover
Cacti may develop white to brown patches spreading across the surface

Common causes

Abrupt transfer from indoor conditions to direct outdoor sunlight
Prolonged exposure to intense summer sun without shade protection
Combined conditions of high temperature (above 35°C) and strong direct light
Magnified light through glass creating localized overheating

Prevention (growing conditions & routine care)

Acclimate plants gradually over 1–2 weeks when moving from indoors to outdoors. Use shade cloth or bright indirect light to protect against intense midday and afternoon summer sun.

When to see a vet

Monitor; consult a specialist if it worsens

What can a nursery or grower do?

Specialist nurseries can assess the extent of sunburn damage and advise on shading, placement adjustments, and watering management to stabilize the plant. Guidance on handling damaged tissue cosmetically can also be obtained.

Related columns

The same problem in other plants

Foliage PlantsLeaf Scorch AgaveSunburn (Leaf Scorch)Caudex PlantsSunburn / Stem Scorch BonsaiLeaf Scorch / Water Stress