Plant care guide
Calathea Sunburn: Spot Scorch and Move It to Safer Light
Updated
Why does my Calathea have sunburn?
Calathea sunburn shows as washed-out, bleached or brown scorched patches on the leaves that face a sunny window. These shade-adapted plants cannot repair scorched tissue, so treatment means moving them to bright indirect light and judging recovery by new leaves.
What to do first
Move the plant out of direct sun to a bright spot, keep the mix evenly moist but not soggy, and do not fertilize to compensate. Trim fully dead leaves; keep leaves that are still mostly green.
Scorched calathea leaves are upsetting, especially on a plant grown for its patterns. The damaged tissue will not turn green again. What you can control is where the plant sits and how the next leaves grow.
Most plants sold as calathea are now classified as Goeppertia. They come from shaded rainforest understories. NC State Extension describes Goeppertia makoyana as thriving in a warm, shaded, humid environment.
What Calathea Sunburn Looks Like
The RHS calathea guide advises a bright spot out of direct sunlight. Its houseplant problems page describes what strong direct sun does. It can cause brown scorched patches on leaves and give them a washed-out appearance.
Clues that support sunburn:
- Damage on the leaves or leaf sides facing the window
- Pale, bleached or faded patterning, especially on the upper surface
- Dry, tan or brown patches in the middle of the blade, not only at the tips
- A recent move to a sunnier spot, or a change of season that brought sun onto the plant
- Shaded leaves on the same plant that look normal
UF/IFAS Extension’s Calathea guide also lists high light among the causes of leaf yellowing. Its suggested treatment includes reducing light levels.
Sunburn or Something Else?
Several problems brown calathea leaves. The position of the damage helps.
| Pattern | More likely cause |
|---|---|
| Scorched or bleached patches on window-facing leaves | Direct sun |
| Brown tips and edges on leaves all around the plant | Low humidity, which the RHS names as the usual cause |
| Dead spots near the leaf margins | Fluoride in water (UF/IFAS) |
| Wilting, rolling, bleaching and crisping in a hot room | Heat stress (RHS) |
| Scorched leaves beside a radiator | Heat from the radiator (RHS) |
| Dry edges or yellowing near a door or window | Drafts (RHS) |
If the plant is also curling, compare with the calathea curling leaves guide. Sun and heat often arrive together in summer.
What to Do
- Move it out of direct sun today. Choose a bright position where the sun does not fall on the leaves. The RHS suggests north- or east-facing windows in summer.
- Do not move it into deep shade. UF/IFAS gives an optimal indoor light level of 150–200 foot-candles (about 1,600–2,150 lux). Calatheas tolerate about 75 foot-candles (roughly 800 lux), but a dark corner is a different problem.
- Use a sheer curtain if the window is the only option. Filtering the light keeps brightness while reducing direct exposure.
- Keep watering steady. The RHS advises keeping the compost evenly moist through spring and summer. Do not let roots stand in water, which the RHS warns can cause rot.
- Do not fertilize as a treatment. Feed cannot rebuild scorched tissue. UF/IFAS also lists excess fertilizer as a cause of brown leaf margins.
- Keep temperatures steady. NC State recommends 18–24 °C (65–75 °F) for G. makoyana. The RHS gives 16–21 °C (61–70 °F) and advises avoiding fluctuations.
Should You Cut Off Sunburned Leaves?
A leaf that is still mostly green still feeds the plant. Leave it in place. Remove a leaf only when most of it is brown, or cut away dead areas with clean scissors for appearance.
Wipe dust from the remaining leaves with a damp, soft cloth. NC State notes that dust on calathea leaves can slow photosynthesis.
Preventing It Next Summer
Sun angles change through the year. A spot that was safe in winter may get direct sun in summer. The RHS suggests a south-facing sill only in winter, when light is lower.
Species differ a little. NC State says the rattlesnake plant, Goeppertia insignis, does not tolerate full sun but will tolerate early morning or diffused sun. Treat that as the upper limit for any calathea.
Judge recovery by the next leaves to unfurl. If they open with clean color and no scorch, the new position is right. Our Calathea and Goeppertia care guide and the calathea hub cover light alongside watering and humidity.
Related guides
Other calathea problems we cover: drooping, water quality sensitivity, leaf movement, root rot, yellow leaves.
References
How this guide was put together: RHS, NC State Extension and UF/IFAS Extension guidance.