Why Is My Aloe Vera Plant Turning Yellow and Brown?

Aloe vera plants with yellowing leaves

Aloe vera is a hardy, succulent, semi-tropical plant native to North Africa and the SW Arabian Peninsula, which can tolerate quite harsh conditions. It will grow in poor soils in hot, dry sunny locations with very little water, but can also tolerate dappled sun or part shade, which allows it to be grown successfully as an indoor plant when located near a window with bright natural light.

When grown outdoors, Aloe vera plants will flower. They produce clusters of dangling tubular yellow or orange flowers on long stalk which grow from the centre of the plant around early spring. They tend not to flower when grown indoors as houseplants.

How Do Healthy Aloe Vera Plants Look?

Healthy Aloe vera plants are grey-green or blue-green in colour, with vibrant green young leaves.

edible Aloe vera barbadensis var. miller
Aloe vera barbadensis var. miller has a green to grey-green colour and a very distinct circular rosette form
Aloe vera var. chinensis non-edible
Aloe vera var. chinensis has a blue-green colour and a very different form, somewhat flatter and stacked rather than a rosette

The Symptoms of an Unhealthy Aloe Vera Plant

When Aloe vera plants are subjected to unfavourable conditions, they may show some of the following signs:

  • Leaves become pale in colour, the green colour fades to a straw yellow colour which eventually turns light brown.
  • Leaf tips darken and dry out.
  • Leaves dry out and wither.
  • Leaves become soft and mushy, and begin to rot.
Aloe vera plants with yellowing leaves
A pair of unhealthy Aloe vera plants that have been overwatered and exposed to sudden cold weather.

What Makes Aloe Vera Plants Unwell and How to Prevent It

When plants get exposed to conditions they don’t like, they become stressed, and start showing signs that they’re unhealthy.

What are the conditions that can stress Aloe vera plants?

1. Overwatering

When Aloe vera plants are overwatered, the leaves will fade in colour, yellow, brown off and eventually rot away.

Testing for overwatering is quick and easy:

  • If the plants are in the ground, push a garden hand trowel into the soil and check if the soil is waterlogged.
  • If plants are growing in pots, lift up the container to check the weight, if it feels excessively heavy it’s because the growing medium is saturated with water.

Aloe vera plants don’t need much water. If they’re growing in containers, water once a week in summer and once every two weeks in winter. All tropical and subtropical plants don’t like too much water when it’s cold, as it rots their roots.

What about rainfall?

When growing Aloe vera in pots or containers outdoors, don’t leave them out in the open in winter where they will be exposed to rainfall, place them in a location that will shelter them from the rain. An ideal place is near a sunny house wall where the roof overhangs and protects them from the rain. I have mine containers of aloe vera growing against a west facing wall, where the afternoon winter sun warms the wall and elevates the winter night temperature around the plants.

Aloe vera plants growing in the ground will be fine if they’re subjected to rain as long as the soil drains well in winter. Heavy clay soils should be amended before planting, the soil in the planting area needs to be mixed with compost (about 25% by volume) to improve drainage.

Can the size of pot make a difference?

Overpotting a plant can cause waterlogging! Aloe vera plants, just like all other succulents, need to be grown in a soil mixture drains freely when grown in pots. Please don’t use garden soil in pots, that becomes mud in containers when it gets wet! Even when using a well draining growing medium (potting mix), if the pot is too large for the plant, the plant’s small root system isn’t capable of taking up all the water, which results in the growing medium staying excessively wet for an extended period of time. This has the same effect as overwatering on the plant.

Aloe vera plants prefer to be snug in their pot with a dense root mass, so when transplanting them, move them up to the next sized pot only, don’t put them in an overly large pot. Give the plant around 3-4 cm (1-1 ½”) of space all round the sides in the new pot. Transplant Aloe vera plants every two years to freshen to growing medium and aerate the roots.

2. Sudden Change in Growing Conditions

Aloe vera plants may be very tough and adaptable, but any plant will get stressed if the growing conditions are changed suddenly.

Here are some examples of sudden changes in growing conditions that can severely stress a plant:

Indoors to Outdoors – If an plant has been growing indoors for quite a while, putting it into outdoors in harsh direct sun will usually burn the leaf tips. Plants need to be ‘hardened off’ by gradually exposing them to increasing levels of sunlight from shade to dappled sun the full sun over several weeks.

Unexpected Drought Conditions – plants dependent on rainfall can become moisture stressed during extended heatwaves which lead to drought conditions. This condition is easy to recognise as leaf tips will usually be burnt, they will be dark brown in colour, and whole leaves may be completely dried out and withered at the base of the plant.

Abrupt Seasonal Changes – when plants are adapted to warm weather, a sudden shift to very cold weather as the seasons change, such as an unseasonal freezing cold night or sudden frost can acutely stress plants. Cold affected plants will usually display a yellowing of the leaves, and frosts will burn the tips of Aloe vera plants.

How To Save a Sick Aloe Vera Plant

When an Aloe vera plant looks unhealthy, it doesn’t take much to bring it back to health if action is taken early enough. Plants are quite capable of recovering if the conditions causing the stress are removed, and growing conditions are corrected and returned back to normal.

The plant pictured below was overwatered and exposed to a sudden seasonal weather shift which brought erratic weather changes and very cold nights after a long warm spell. This Aloe vera plant was completely yellowed, and the outer leaves had turned a light brown colour.

To save the plant, it was placed in a greenhouse where it wouldn’t be watered by gardeners, receive rainfall, or be exposed to cold night temperatures.

After two weeks, there are signs of recovery as the inner leaves start to green once again and take on their natural colour.

Aloe vera plant with yellowing leaves

A stressed out Aloe vera plant showing signs of recovery – green leaves!

Restoring conditions which assist with plant recovery are fairly straightforward.

  • Overwatered plants – stop watering, and place them under cover away from rainfall.
  • Overpotted plants – transplant into a smaller pot, so the potting medium will dry more easily between waterings.
  • Drought-stricken plants – remove burnt leaves, do not remove leaves with burnt tips, water plants to restore soil moisture, also consider using seaweed extract as it acts as a root growth stimulator and also helps stressed plants recover.
  • Cold-stressed plants – place pots near a wall that receives midday or afternoon sun to keep overnight temperatures higher around the plants, water less often in winter, keep the plants out of the rain, and remove any saucers underneath that retain water.

Given time, the plants will green up on their own and totally recover, all they need is a little help!

You might also like these other articles on Aloe vera plants:

12 thoughts on “Why Is My Aloe Vera Plant Turning Yellow and Brown?

    1. When the situation gets worse, the Aloe vera leaves droop too. Next step is that they go soft and mushy, and rot. Then they dry and shrivel up. If the whole plant gets like that you can lose it. Please follow the instructions and you’ll recover your plant!

  1. thats true about aloe vera as i was away a month it didnt look good, hubby feeds the plants, now its improved, my lemon plant from pips dont lookas good outside as something is eating it, leaves are slightly brown

  2. I took a very good sized pup and put it in its own pot at least a year ago. It has struggled. It has the same five leaves that it had when I planted it. The inner two leaves are healthy looking in color and form. The outer two, though, are more of an olive green color and the tips of the leaves are flat. From everything I’ve read that seem to mean that I wasn’t giving it enough water. I use a water meter and generally I don’t water less than every week and a half to two weeks. Recently I repotted it into a 5” pot. I had been keeping it in a smaller 3 inch pot right against a windowsill where I got morning sun. Now I have it on the back porch and I’m sure it’s confused about everything. Do you have any idea what this olive green color suggests. Thanks.

    1. Hi Meri, when the colour of Aloe vera leaves changes from a bright green to a more olive green, the olive colour is a combination of green and brown, so it’s the beginning of the leaves turning yellow/brown. Be patient with the plant, especially if you’re repotted it recently, as it takes time to re-establish. Not sure what the season is there, but don’t keep it too close to the glass window pane, as it gets really cold overnight in winter, and extremely hot in summer. Putting it outside is okay in the warmer seasons, but a bad idea in the cooler seasons. Hope this helps.

      1. I’m in Boston where it’s summer. I’ve moved it to where it’s about a foot from the east facing window. You think that even though the ends of the leaves are flat I should hold back on the watering? The reason I put it in a slightly larger pot (5”x5”) was so that it wouldn’t dry out so fast. I think that was messing me up on knowing when it needed water. Is there any way to send you a photo to get your opinion if the pot is the right size?

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