ecoLeaf symptoms

Leaf Scorch

Pale or bleached patches and papery brown scorch marks on the leaves facing the window — most often caused by too much direct sun, a sudden move into much brighter light, or leaves resting against hot window glass.

Low RiskEasy to DiagnoseEnvironment-related

self_improvementSeverity hint

Scorched patches stay on old leaves but the damage does not spread like a disease — move the plant out of harsh light and new growth comes in healthy.

Key Symptoms

Match the visible pattern before looking for causes.

Pale or bleached patches on sun-facing leaves

You notice washed-out white or pale tan patches on the parts of the leaves that face your brightest window. They look papery thin and feel dry, not soft.

Brown papery patches that feel crispy and dry

Brown areas don't wipe off and feel brittle and crisp when you touch them. The marks stay even if you water or move the plant.

Scorch only on the side facing the window

Damage sits on the side toward the glass while leaves on the shaded side stay green. Upper or outer leaves are hit first.

Crispy brown edges and tips on outer leaves

Leaf margins and tips turn brown and dry out first, especially on leaves nearest the glass. The brown edge stays even if the leaf perks up after watering.

Scorched spots surrounded by yellow halos

You may see a yellow ring around brown centers, especially on thin-leaved tropical plants that were healthy before.

Start With What You See

Choose the situation that best matches your plant.

Bleached, pale patches only on the side facing your brightest window, and your plant sits in strong direct sun for several hours a day with no recent move

When shade-adapted leaves get hours of hard direct sun each day, the sun-facing surface bleaches and turns papery. This is the classic too-much-sun pattern.

Likely cause: Too Much Direct Sun

See Treatmentarrow_forward

Pale scorched patches with yellow halos showed up within a few days after you moved the plant to a brighter window, brought it home, or put it outside

Leaves that haven't had time to build sun protection scorch quickly after a sudden light jump, even from a short burst of unacclimated sun.

Likely cause: Sudden Light Increase

See Treatmentarrow_forward

Crispy brown edges on leaves that touch or sit within about 30cm of the glass, and the air right next to the window feels hot in the afternoon

Glass magnifies and traps heat, so leaves sitting very close dry out first. If the air feels hot and the worst damage is nearest the pane, heat is amplifying the scorch.

Quick check

At the hottest part of the afternoon, hold your hand just above the worst-burned leaves nearest the glass — does it feel noticeably hot and are those leaves closest to the pane?

Likely cause: Windowsill Heat

See Treatmentarrow_forward

Brown edges or tips appear evenly on all sides of the plant, not just the sun-facing side, especially after the soil dried out completely, you fertilized recently, or the plant sat near a cold draft or heater

This page covers light and heat scorch only. Even browning all around, or scorch linked to very dry soil, recent fertilizer, or cold, often points to drought, fertilizer or salt burn, or cold damage rather than sun — compare the light and heat causes below to rule them out — if none fit, revisit your watering, feeding, and temperature.

Compare Common causesarrow_forward

Not sure, or more than one of these sounds true

Walk through a short step-by-step check to tell too much sun, a sudden light jump, and windowsill heat apart.

Continue to Diagnostic flowarrow_forward

Common Causes

Start from the top. Match what you can observe, then use one check to confirm.

Too Much Direct Sun

Best Match If

checkBleached, pale patches on the upper surface of leaves facing the window, often turning papery white or brown over a few days
checkThe damage almost always sits on the side of the plant facing the brightest light — the shaded side stays green
checkA faded, washed-out look across the whole canopy in plants that have been pushed too far
checkCrispy, dry edges on the side of the leaf nearest the glass

Next Check

At midday, look at the burned patches through the glass — if strong direct sun is hitting them and only the sun-facing side and upper leaves are affected, this is the cause.

Why It Happens

Most tropical houseplants are forest understorey plants, evolved to live under a canopy → hard, direct sun on a south-facing windowsill overwhelms those shade-adapted leaves and the chlorophyll in the leaves bleaches under the load → leaf cells on the light-facing surface dry out and die, so the damage shows up as bleached, papery, or brown patches on the parts of the leaves facing the strongest light; the patches feel papery and crispy and do not fade. Leaf scorch is a non-infectious condition caused by unfavorable environmental situations, not by a disease organism, and sunburn damage on a leaf is permanent — the leaf will not turn green again.

Sudden Light Increase

Best Match If

checkPale, scorched patches appeared within a few days after you moved the plant from a dim corner, shop, or indoors to a brighter window or outside
checkThe burn is uneven — only the newly exposed side or leaves show scorch while the shaded side or older shaded leaves stay green
checkYellow halos around brown patches, especially on tropical plants like Calathea, Maranta or Anthurium that were healthy before the move
checkA plant that looked fine all winter suddenly scorched in late May or June when light intensity jumps through clean glass on south or west windows

Next Check

Think back over the past 2 to 3 weeks — did you move the plant to a brighter spot, bring it home, or put it outside?

Why It Happens

Most tropical houseplants are forest understorey plants, evolved to live under a canopy, not hard direct sun → when you move them too quickly from low light to high light they have no time to build photoprotection → even a short burst of unacclimated direct sun bleaches and scorches the unprepared leaves. Most sunburn happens because a plant moves too quickly from low light to high light.

Windowsill Heat

Best Match If

checkScorch is worst on leaves that touch the glass or sit closest to the window pane
checkScorched leaves may be more abundant on the side of the plant most exposed to strong sunlight or reflected heat, such as the side facing the window or near a warm wall or radiator that bounces heat back
checkLeaves show crispy, dry edges and wilting, particularly in hot and dry weather near the window — the brown edges stay even if the plant perks up after watering
checkGlass surfaces near a sunny window can hit 40C in summer, which causes its own damage that looks like sunburn — the air right next to the window feels hot to your hand
checkThe plant sits within about 30cm of the glass in summer with leaves touching or almost touching the pane, leaving well under the 30 to 60cm gap that is often enough to prevent scorch

Next Check

At the hottest part of the afternoon, hold your hand just above the scorched leaves near the glass — if it feels noticeably hot and the worst damage is on the leaves nearest the pane, this is heat-amplified scorch.

Why It Happens

Leaves that touch or sit very close to the glass can scorch because the window magnifies and radiates heat, trapping still, hot air around them → in that heat, large amounts of water evaporate from leaf surfaces and the plant roots are unable to furnish enough water to compensate for that loss, so leaf tissue dies → the leaf margins and tips closest to the glass dry out first and turn brown and crispy. Prolonged high temperatures, hot, drying winds, and low rainfall are the most common reasons for leaf scorch outdoors, and the same heat-driven water loss happens on a sunny windowsill. Glass surfaces near a sunny window can hit 40C in summer, which causes its own damage that looks like sunburn, and scorched leaves may be more abundant on the side most exposed to strong sunlight or reflected heat.

Diagnostic Flow

Check these in order. If one answer lands on a likely conclusion, treat that as your stopping point before moving into the matching treatment.

Did the pale or brown patches show up within a few days after moving the plant to a brighter window, bringing it home, or putting it outside?

If yesScorched patches showed up quickly after a move to brighter light

Likely cause

Sudden Light Increase

Leaves scorched soon after a light jump haven't had time to build protection — this points to a sudden increase

If noPlant has stayed in the same spot for weeks with no recent move

Without a recent move, check whether heat near the glass or chronic direct sun is driving the scorch next

Not sureHard to tell if and when it was moved

Think back 2 to 3 weeks — if you can't recall a move, continue to check heat and sun intensity next

Do the worst-scorched leaves touch the glass or sit within about 30cm of a sunny window?

If yesLeaves touch or sit within about 30cm of the pane

Likely cause

Windowsill Heat

Glass traps and radiates heat — confirm by feeling the air near the pane on a hot afternoon; leaves closest to the pane dry out and scorch first

If noLeaves sit well back, closer to the 30-60cm safe gap than to the glass

Heat is less likely — check how much direct sun hits the patches next

Not sureHard to tell how far the leaves sit from the glass

At the hottest time, hold your hand just above the leaves nearest the glass to feel the difference

Does strong direct sun hit the scorched patches for several hours around midday, especially on the upper leaves facing the window?

If yesStrong sun hits the patches for hours each day

Likely cause

Too Much Direct Sun

Hours of hard sun bleaches shade-adapted leaves — these papery marks are permanent and won't fade

If noNo direct sun on the patches — browning is even on all sides or the plant is not in sun

Even browning without direct sun is often not light scorch — it usually points to drought, fertilizer burn, or cold damage, which this page's causes do not cover; review recent watering, feeding, and temperature before treating it as sun.

Not sureHard to tell where the sun falls at midday

Watch the window at midday — if only the sun-facing side is damaged, light or heat scorch is still most likely

Treatment

Start with safe stabilizing actions, then follow the plan that matches the diagnosed cause.

Treatment plan by cause

Too Much Direct Sun

Use this plan if bleached, pale patches on the upper surface of leaves facing the window, often turning papery white or brown over a few days, or the damage almost always sits on the side of the plant facing the brightest light — the shaded side stays green.

Today

Move the plant out of direct sun
Pull the plant back about 1 metre from the window
Leave scorched leaves in place for now — remove a leaf only when it is more than half dead

Next a few weeks

Filter strong sun with a sheer curtain on south or west windows from late spring to early autumn
Check the leaves every few days for new pale patches
Water as normal, at the same rhythm as before the scorch — about every few days for most houseplants
Rotate the plant a little every week or two so one side does not stay in harsh sun

What to expect

New leaves should come in clean over the next few weeks once the plant is out of harsh sun
Scorched patches on old leaves will not turn green again
If no new growth appears after a month or so, move the plant a bit farther from the window or add a sheer curtain

Don't do this

Well-meant fixes that can make the problem harder to diagnose.

Cutting off all scorched leaves right away to tidy the plant

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Even partly burned leaves still photosynthesise and help shield younger leaves, and cutting them off too early just sets the plant back further. Remove a leaf only when it is more than half dead.

Feeding a sunburned plant to help it recover faster

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Hold off feeding for a couple of weeks. Stressed plants do not benefit from fertiliser; nitrogen pushes weak new growth.

Watering more often or soaking the soil to make up for sun damage

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Sunburn is not a watering problem and changing your watering rhythm to compensate usually causes a second issue. Water as normal.