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Why are my plant's leaves turning brown and crispy?

Guidance verified against university horticulture extension sources on 17 August 2026. Sources linked below.

Brown, crispy leaves usually mean low humidity, salt build-up from fertiliser or tap water, or water stress, not one single cause. Check which leaves are affected first: crispy edges and tips point to humidity or salt, a whole scorched leaf points to direct sun, and browning only on the oldest, lowest leaves is usually just normal ageing.

What causes brown, crispy leaves on a houseplant?

Five causes account for almost every case, and they rarely look identical once you know what to check.

Which leaves are affected? Use the pattern to narrow it down

Where the brown shows up matters more than how brown it is. The same colour change means something different depending on which leaves it hits and where on the leaf it starts.

Is it low humidity?

Low humidity is the most common cause of crispy brown tips and edges, and it is worst through winter when heating dries the air. Most tropical houseplants come from environments far more humid than the average home, and edges are the first tissue to dry out because they are furthest from the leaf's water supply. Group plants together, sit pots on a pebble tray with water below the pot base, or run a humidifier nearby; misting gives only a brief, minor lift and is not a reliable fix on its own. The full humidity guide ranks these methods by how much they actually help. The same dry air lets spider mites build up quickly, so check for fine webbing or pale stippling if the browning comes with a general decline.

Is it fertiliser or salt build-up?

Too much fertiliser, or fertiliser applied too often, burns roots and shows up as brown, crispy edges. Salts accumulate in the potting mix faster than the plant can use them, drawing moisture away from the roots instead of feeding the plant. A white or crusty build-up on the soil surface or pot rim is a visible tell. Flush the soil with plenty of plain water until it runs freely from the drainage holes, and cut fertiliser back to a lighter, less frequent dose, particularly outside the active growing season. See the full fertilising guide for how much and how often to feed correctly in the first place.

Is it your tap water?

Fluoride, chlorine and dissolved mineral salts in tap water accumulate in soil over weeks and months and eventually reach levels that burn sensitive plants, showing up as the same tip and edge browning as salt build-up. Spider plant, dracaena, prayer plant, calathea and ti plant are known to be particularly sensitive to fluoride. If tip burn keeps recurring despite otherwise good care, switch to filtered, distilled or collected rainwater rather than straight tap water.

Is it a watering problem?

Both under and overwatering can cause brown, crispy edges, alongside a wilting or drooping plant. Letting a plant dry out for too long between waterings stresses the leaf tissue and browns the edges first; overwatering damages the roots, which then cannot supply the leaf with enough water to stay hydrated, producing a similar dry, crispy edge even though the soil is wet. Check the soil before assuming either direction: see the full watering guide for the finger test, and the root rot guide if the soil is staying wet.

Is it too much direct sun?

Direct sun scorches a leaf rather than drying its edges evenly, and the damage concentrates on whatever side faces the window. Expect bleached or pale patches first, moving to fully crispy, brown tissue on the worst-affected leaf, while the shaded side of the same leaf stays green. Move the plant back from the glass or behind a sheer curtain; sun damage does not reverse on the affected leaf, but new growth in a better spot comes in undamaged.

Is it just normal ageing?

An older leaf browning low on an otherwise healthy plant is usually normal ageing, not a problem. Plants shed their oldest leaves as they grow, and the lowest leaf is always the first to go. Worry when several leaves brown at once, when new leaves brown, or when the browning comes with wilting or yellowing rather than sitting on one old leaf alone.

Could cold draughts or pests be browning the leaves?

Yes: cold draughts and spider mites both brown leaves, and each leaves a different pattern from low humidity. Chilling injury shows as blackened or browned new growth, wilting or leaf drop on the plant nearest a cold window, external door or vent, and it appears after a cold night rather than building slowly. Spider mites cause stippled, dull yellowing leaves with fine webbing that dry out and drop in severe cases, and dry indoor air favours them. Check the undersides of leaves before changing anything else.

Can overwatering and root rot turn leaves brown?

Yes: overwatering and root rot turn leaves brown, usually with wilting or yellowing, soft stems and wet soil that does not dry out. Root rot follows overwatering or a pot with poor drainage. To confirm it, slide the plant from its pot: healthy roots are firm and creamy white or pale yellow, while rotten roots are brown, black, mushy or foul smelling. Trim the affected roots and repot in fresh, free-draining mix. The browning is dry and crispy when the cause is humidity or salts, and soft and dark when the cause is rot; see root rot for the full fix.

Should you cut off brown leaf tips?

Cutting off brown tips is optional; the dead tissue will not turn green again either way, and leaving it does not harm the plant. If the look bothers you, trim along the leaf's natural pointed or rounded shape with clean, sharp scissors, following the edge rather than cutting straight across. Fixing the underlying cause matters more than the trim: new growth browns the same way if humidity, salt or watering is not addressed first.

FAQ

What causes brown crispy edges on houseplant leaves?

Most often low humidity, salt build-up from fertiliser, fluoride or chlorine in tap water, or inconsistent watering. Sun scorch and normal ageing cause browning too, but with a different pattern: scorch hits the sun-facing side of a leaf, and ageing hits only the oldest, lowest leaves.

Should you cut off brown leaf tips?

It is optional and does not harm the plant either way, since the brown tissue is already dead. Trim along the leaf's natural shape with clean, sharp scissors if it bothers you, or leave it; fix the underlying cause first or new growth browns the same way.

Is one brown leaf on a houseplant normal?

One brown leaf, especially an older leaf low on the plant, is usually normal ageing. Worry when several leaves brown at once, when new leaves brown, or when browning comes with wilting, yellowing or a clear pattern like scorch or crispy edges.

Will brown leaves turn green again?

No. Once a leaf has turned brown the damaged tissue does not recover. Fix the cause and new growth should come in healthy, so the plant replaces the damaged leaves over time.

Can cold draughts cause brown leaves on indoor plants?

Yes. Chilling injury causes browned or blackened new growth, wilting and leaf drop, so keep plants away from open windows, external doors and cold spots in winter.

Related guides

Sources

• Iowa State University Extension and Outreach, Why does my houseplant have brown leaf tips and edges?
• University of Missouri Integrated Pest Management, Leaf Tipburn on Houseplants
• University of Maryland Extension, Excess Fertilizer or Salt Damage on Flowers
• Missouri Botanical Garden, Environmental Conditions (problems common to many indoor plants)
• Connecticut Agricultural Experiment Station, Diagnosis of Common Houseplant Problems