PlantRx

Aloe vera leaves turning brown

By Karim DiabatePublished Updated How these guides are built

Brown on an aloe vera leaf is dead tissue, so the useful question is not how to bring it back, because it will not come back. It is what killed it, and whether it is still happening. Where the brown starts is the clue.

A healthy Aloe Vera, photographed for reference
A healthy aloe vera for comparison. This is a reference photo, not a picture of the problem. Photo by MidgleyDJ and Wikimedia Commons contributors (CC BY-SA 3.0), via Wikimedia Commons.

What is specific to this plant

  • A thirsty aloe curls its leaves inward and they feel thin and flat. A drowning one goes soft and translucent from the base up. These look nothing alike once you know to check the texture.
  • Aloe grown in too little light flops outward from the centre instead of holding an upright rosette, and it will not stand back up.
  • Reddish or bronze leaves are usually sun stress or cold, and are not a disease.

What it could be, and how to tell

These look alike in a photograph, so each one below lists what you would ALSO see if that is the cause. Work down the list and stop at the one where the other symptoms match too.

most common

1. Bronzing that is sun stress rather than damage

What else you would see

  • a reddish or copper flush across the whole leaf
  • the colour strongest on the leaves facing the light
  • the leaves still plump and firm
  • a recent move outdoors or onto a sunnier sill
How to confirm it: Press the leaf and check whether it is still plump. An aloe reddens or bronzes in strong light or cold as a stress response, not as a disease, and a firm bronze leaf is a working leaf. It reads alarming because the colour change is dramatic, but a soft leaf is the finding that actually matters and this is not that.

What to do

  1. Move it into gentler light if you would rather it stayed green, though the colour is not harmful.
  2. Introduce any move outdoors gradually, since sudden full sun is what causes the sharpest change.
  3. Leave the watering unchanged.
common

2. Underwatering, or letting it dry out too far

What else you would see

  • leaves wrinkled and flexible rather than soft and translucent
  • the pot noticeably light to lift
  • growth stalled, with no new leaves for a long stretch
How to confirm it: Dry soil pulled away from the pot wall, with foliage that improves noticeably within a day of a thorough soak. If a thorough watering changes nothing in twenty four hours, stop assuming thirst and check the roots.

What to do

  1. Water thoroughly until it runs freely from the drainage holes, rather than a splash at the surface.
  2. If the mix has gone water-repellent and the water runs straight through, stand the pot in a basin of water for half an hour to rewet it properly.
  3. Water on dryness rather than on a fixed day of the week, and this is how far it should dry: the whole pot.
common

3. Overwatering, and the root rot that follows

What else you would see

  • lower leaves going translucent, yellow and squishy rather than wrinkled
  • leaves dropping at the lightest touch
  • a stem that is soft or darkened at the soil line
  • soil or mix still wet several days after watering, when this much should have dried: the whole pot
How to confirm it: Slide the plant out of its pot and look at the roots. Healthy ones are firm and pale. Brown, soft, or hollow when you press them means rot, and that changes what you do next completely.

What to do

  1. Stop watering and let it dry down this far: the whole pot.
  2. Check that the pot drains and empty any saucer or decorative outer pot it sits in. Water held out of sight keeps the mix wet whatever you change above it, and it stays invisible until you lift the pot.
  3. If the roots are soft and brown, trim them back to firm tissue with a blade sterilised first and repot into fresh gritty cactus or succulent mix.
less common

4. Cold or a draught

What else you would see

  • damage that appeared within a few days of a cold snap, or of the heating or air conditioning coming on
  • the plant sits near a window, an exterior door or a vent
  • the damage is worst on the side facing the cold
How to confirm it: Sudden onset on the exposed side only, following a temperature change. A leaf resting against cold glass overnight is enough to do it.

What to do

  1. Move the plant away from the glass, the door or the vent.
  2. Damaged tissue will not recover. Leave it unless it turns soft, which is the point at which it can start to rot.
less common

5. Ordinary ageing

What else you would see

  • one or two of the oldest, lowest leaves at a time and no more
  • healthy new growth continuing from the centre or the tip
  • no other symptom anywhere on the plant
How to confirm it: Oldest leaves only, while the plant is still producing new ones. A plant funding new growth from its oldest tissue is working normally.

What to do

  1. Remove the spent leaf at its base with a clean blade, purely for looks.
  2. Nothing else is needed.

Common questions

Should I cut brown leaves off?

Once a leaf is more brown than green, take it off at the base. If only part of a leaf is brown, you can trim the dead section at an angle and leave the rest, since a partly green leaf still does useful work.

Will the brown parts recover?

No. Brown tissue is dead and stays dead. Success is measured by whether the NEW leaves come in clean, which takes a few weeks after the cause is fixed.

Crispy brown or soft brown, does it matter?

It matters a great deal. Crispy and dry points at too little water, dry air or sun. Soft, dark and damp points at too much water or at a rot, and those need opposite responses.

Before you act on any of this

This is general plant care guidance for a plant, not advice about people or animals. We never tell you whether a plant is safe to eat or touch, and we never tell you a plant is safe for a child or a pet. If a child or animal may have eaten any part of a plant, contact Poison Control (US 1-800-222-1222) or a vet immediately rather than reading further.

Treatment advice here is deliberately category level. We do not give product names, mixing ratios or application intervals. Whatever the label on the product in your hand says is the instruction that counts, and following it is your responsibility.

Where this comes from

The general horticultural facts behind this differential come from published university extension and Royal Horticultural Society guidance. What is specific to this plant, and the order the causes are ranked in, is ours, and the methodology page says where that reasoning stops being reliable.

Other aloe vera problems

Not sure which one it is?

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