Brown Leaf Tips on Houseplants: Causes and How to Fix Them

Brown leaf tips on houseplants are one of the most common complaints, and one of the most misdiagnosed. People often blame dry air, buy a humidifier and keep getting brown tips, because the real cause was salt build-up or watering. The tip is simply the furthest point from the roots, so it's the first place any shortage of water reaching the leaf shows up.

The good news: the pattern of browning, the plant and your routine usually point clearly to one cause. Here's how to work it out.

The main causes at a glance

1. Watering swings

Uneven watering is the most common cause. When soil dries out too far, the fine roots that supply the leaf tips die. The plant can't move enough water to the furthest points, so tips brown even after you water again.

Fixes:

• Water when the top few centimetres are dry rather than waiting for the whole pot to dry, unless it's a succulent.
• Water thoroughly so the whole root ball is moistened. If water runs straight through a dried-out pot, soak it in a bowl for 20 minutes.
• Check plants more often in summer, in warm rooms and in terracotta pots.

Read how to water houseplants and use the plant watering schedule to set check reminders.

2. Low humidity

Thin-leaved tropical plants lose water quickly through their leaves in dry air. When heating pushes indoor humidity below about 30 to 40 percent in winter, their tips and edges crisp.

Plants most affected: calathea, prayer plant, maidenhair fern, Boston fern, areca palm, majesty palm, alocasia and caladium.

Fixes:

• Use a humidifier near the plants; it's the only method that reliably raises humidity in a room.
• Group plants together.
• Move them away from radiators and heating vents.
• Consider a bathroom with a window for the fussiest ones.

Misting raises humidity for only a few minutes. Check real conditions with the plant humidity checker.

3. Fertiliser and salt build-up

Every fertiliser feed and every watering with hard tap water leaves dissolved salts behind. Over time, they build up in the soil and draw water out of roots, burning them. Leaf tips brown, often with a distinct, sharp edge between brown and green. You might see a white crust on the soil surface or on terracotta.

Fixes:

1. Flush the soil. Every two or three months, run lukewarm water slowly through the pot for a few minutes, about four times the pot's volume, and let it drain.
2. Feed less. Use half strength, and only in the growing season. See the fertilizer dilution calculator.
3. Scrape off crust from the soil surface and replace the top layer.
4. Repot in fresh compost if salts are severe.

4. Tap water sensitivity

Some plants react to fluoride, chlorine or high mineral levels in tap water. The classic examples are spider plants, dracaenas, calatheas, prayer plants and peace lilies.

Fixes:

• Use rainwater, distilled water or filtered water for sensitive plants.
• Letting tap water stand overnight lets chlorine escape but doesn't remove fluoride or minerals.
• Flush the soil occasionally.

5. Overwatering and root rot

This surprises people: too much water can cause brown tips too. Waterlogged roots suffocate and rot, so they can't take up water, and the leaves show drought symptoms. The difference is that the soil is wet, browning often has a yellow band behind it, and lower leaves yellow.

Fixes:

• Let the soil dry more between waterings.
• Make sure the pot has a drainage hole and that it isn't sitting in water in a cachepot.
• If the soil smells sour and roots are brown and mushy, follow root rot treatment.

See overwatered plant signs.

6. Root-bound plants

When roots fill a pot, there's little soil to hold water, so the plant dries out within a day or two after watering and the tips brown. Roots circling the pot or coming out of the drainage hole are the giveaway. Repot in spring into a pot one size bigger. See how to repot a houseplant and the repotting pot size calculator.

7. Cold and draughts

Cold air from windows at night, outside doors and air conditioning can damage leaf tips, sometimes turning them brown-black. Move plants away from cold glass in winter and keep tropical plants above about 15 °C.

8. Sun scorch

Brown, papery patches on leaves facing the window, often after moving a plant or a sudden hot spell, are sun scorch. It usually affects the middle or edges of leaves rather than just the tips. Move the plant back from the glass or add a sheer curtain.

Quick diagnosis by plant

How to trim brown tips neatly

1. Use clean, sharp scissors.
2. Follow the natural shape of the leaf, cutting an angled point rather than a straight line.
3. Leave a very thin edge of brown so you don't cut into green tissue, which would start a new brown edge.
4. For leaves that are more than half brown, remove the whole leaf at the base.

Trimming is cosmetic. Fix the cause, and judge success by the new leaves.

A simple routine to prevent brown tips

• ☐ Water thoroughly when the top few centimetres are dry (succulents: when dry right through)
• ☐ Use rainwater or filtered water for sensitive plants
• ☐ Feed at half strength in spring and summer only
• ☐ Flush the soil every two or three months
• ☐ Keep thin-leaved tropicals away from heaters; add humidity in winter
• ☐ Repot plants that dry out within a day or two

For other symptoms, see plant leaf problems and curling leaves on houseplants.

Sources and further reading

• UC Statewide IPM Program: Houseplant problems, for diagnosing care and pest issues.
• Royal Horticultural Society: Houseplants, watering and feeding, for watering and fertiliser practice.