Yes, houseplants can get sunburned. The damage shows up as bleached, papery, or brown patches on the parts of the leaves facing the strongest light, and once a leaf is burned, the marks do not fade. The leaf itself does not heal, but the plant almost always recovers if you move it before the damage spreads.
Sunburn (more accurately, light scorch) happens when a plant gets more direct sun than it has adapted to. Most tropical houseplants we sell are forest understorey plants, evolved to live under a canopy. Hard, direct UK summer sun on a south-facing windowsill is unfamiliar territory for them, and the chlorophyll in the leaves bleaches under the load.
What Sunburn Looks Like on Houseplants
Light scorch has a recognisable signature once you know what to look for:
- Bleached, pale patches on the upper surface of leaves facing the window, often turning papery white or brown over a few days
- Crispy, dry edges on the side of the leaf nearest the glass
- Yellow halos around brown patches, especially on tropical plants like Calathea, Maranta or Anthurium
- A faded, washed-out look across the whole canopy in plants that have been pushed too far
The damage almost always sits on the side of the plant facing the brightest light. If the brown patches appear evenly across the whole plant, the cause is more likely watering, humidity, or fertiliser issues. Our short guide on brown leaf tips covers those alternatives in more detail.
How to Acclimatise Houseplants to More Light
Most sunburn happens because a plant moves too quickly from low light to high light. Acclimatisation is the fix.
- Start in shade. Place the plant 1 to 2 metres back from the bright window for the first 4 to 5 days.
- Move it forward slowly. Cut the distance roughly in half every 4 to 5 days.
- Watch for signs. Pale new patches or a faded look mean stop. Hold position for another week.
- Total acclimatisation takes 2 to 3 weeks for most plants. Cacti coming out of low light to summer sun need longer, sometimes 4 to 6 weeks.
This is the same routine our growers use when moving plants from our growing tents into the shop floor. Our guide to caring for a new houseplant covers the wider settling-in process.
How to Fix a Sunburned Plant
Sunburn damage on a leaf is permanent. The leaf will not turn green again. But the plant itself almost always recovers, and the new leaves come in clean.
- Move the plant out of direct sun. Pull it back from the window or move it to a different room. Even a 1 metre shift can be enough.
- Leave the damaged leaves alone for now. Even partly burned leaves still photosynthesise. Cutting them off too early just sets the plant back further. Remove a leaf only when it is more than half dead.
- Hold off feeding for a couple of weeks. Stressed plants do not benefit from fertiliser; nitrogen pushes weak new growth.
- Water as normal. Sunburn is not a watering problem and changing your watering rhythm to compensate usually causes a second issue.
- Check humidity. Sunburned tissue dries out faster, so plants in dry rooms may need a bit of extra humidity for a few weeks.
Preventing Sunburn on UK Houseplants
UK indoor light is unusual: low and weak through winter, then suddenly intense for a few months in summer, especially through clean glass on south or west-facing windows. Most sunburn cases we see at the nursery happen in late May and June, when light intensity jumps but plant owners have not adjusted positions.
A few habits that prevent it:
- Move tender plants back from the glass between May and August. A 30 to 60cm gap is often enough.
- Use a sheer curtain on south or west-facing windows from late spring to early autumn. The diffused light suits almost every common houseplant.
- Rotate plants weekly. Even acclimatised plants burn on one side if they sit unmoved for months.
- Never put a plant in summer sun straight after delivery. Acclimatise first.
- Watch the temperature, not just the light. Glass surfaces near a sunny window can hit 40C in summer, which causes its own damage that looks like sunburn.