How To Fix Brown Spots on Aloe Vera

It is not common to see Aloe vera to appear unhealthy since this robust plant is rarely in trouble. It is able to withstand extreme environmental changes like prolonged dry spells.

However, as the old songs suggest, “Even the best fall down sometimes” Your aloe vera is also going to have the moment of weak spots.

One issue you’ll face in your aloe plants are the brown spots that show up on the leaves.

The spots can be found in a variety of dimensions and shapes. The color can differ between light and dark depending on the cause of the issue.

The brown spots on aloe vera could be caused by illnesses (aloe vera leaf spots and aloe rust) and edema, excessive light, pests fertilizer problems, inadequate ventilation, excessive humidity, as well as frost-related damage. The majority of the time these factors are connected to one another. This is why the issue could be caused by the interaction of these factors.

What is the reason my Aloe vera Plant Show Brown Spots?

The brown spots on aloe vera could be explained by a variety of phenomenon. Some of them are caused by biological causes while others can be attributed to chemical and physical factors that are present in the surrounding environment.

To make sure you comprehend each reason, we will describe the mechanism that is at work behind each aspect, so be sure to read:

Aloe Vera Leaf Spot Diseases

Alternaria alternata is the pathogen that causes leaf spot disease that affects aloe vera. The organism causes tissue destruction of the leaves, which causes discoloration. It also decreases the plant’s ability to fight off bacteria.

The leaf spots initially appear as tiny black spots that appear on the leaves.

The spots will grow larger over time until they become a single unit and cause massive damage. Color of affected area changes from dark brown and then black.

Quick Solutions:

There isn’t a definitive cure for these illnesses. But, there are methods to control them so that they do not cause any damage for the plants.

  1. You should isolate your aloe. It is important to isolate the affected plant from other plants to stop spread of the illness.
  2. Choose a dry, less humid area. A humid environment is an ideal condition for fungi to flourish. Therefore, the likelihood of developing disease is more likely when humidity is high.
  3. Take out the affected areas. The removal of the areas that are affected can reduce the chance of spreading the pathogen.
  4. Don’t water the foliage. The watering of the foliage can result in the leaves becoming always damp. This makes it easier for pathogens to flourish and make your aloe plant vulnerable to disease.

two aloe vera plants held up in white pots

Aloe Rust

Aloe rust is a fungal illness that is caused through the pathogen Phakopsora pachyrhizi. A leaf that has been infected by this fungus may display small white spots appearing on surface of the leaf. The spots will eventually get larger and turn brown in the color.

Quick Solutions:

To treat a diseased aloe vera plant, look up the quick remedies that were mentioned earlier.

Excess Light

Aloe vera likes receiving bright light. But, it doesn’t like direct exposure to intense levels of light.

Long-term exposure to the sun particularly in the summer months, could easily burn the leaves , leaving brown spots.

In certain situations the act of putting your aloe vera in direct sun will cause the entire leaves to change color.

A light source that is artificial could cause the same harm when it’s placed close to the aloe.

Quick Solutions:

Here are some effective methods to address the problem of brown spots caused by light sources that are too bright:

  1. If your aloe vera plant is situated outside, bring it inside. It is evident that prolonged exposure to sunlight isn’t aiding the plant.
  2. Pick a southern or western window. Plant your aloe close to the window, but keep sufficient distance so that the leaves don’t touch glass.
  3. Create a sheer curtain that can provide shade when the light becomes too intense.
  4. If you are using artificial light be sure to keep it at a distance of minimum six feet away from the aloe vera plant.
  5. Limit exposure to sunlight to a maximum of 6 hours. You can let aloe drink the sun’s rays but be sure to not exceed the permitted maximum time. Of course, you should not use it every day, particularly during summertime.


If you observe that the surfaces of aloe vera leaves is creating blister-like structures, it could be due to edema.

It’s a condition in which the cells within the plant break due to the pressure of water. The pressure is created when the water flow within the plant is higher than the outflow.

Edema is usually triggered when the soil is excessively humid, accompanied by low temperatures and high humidity. In these conditions when transpiration is slower, it results in the plant losing less water.

Quick Solutions:

Edema is a result of a mix of undesirable factors in the environment. Although we are not able to influence the environmental conditions but there are methods to reduce its negative impact.

  1. Let the soil dry in between irrigations. Also, aloe vera doesn’t require a lot of water since it has a sufficient water in its leaves. Make sure to check the soil’s for moisture before you water again.
  2. Spread your plants out. This can help with circulation of air. Plants that are in a group are usually in a high humidity area.
  3. The more exposure you get to the sun. This will speed up the release of water out of the plants.

When the environmental conditions are back to normal and the plant is able to heal from swelling. Therefore, there’s no need to stress all the time about this.

Temperature Stress

Temperatures ranging from 55 to 80degF (13-27degC) are perfect to grow aloe vera. It prefers a warmer climate in comparison to one that is colder. Temperature fluctuations are usually a thing to be able to bear when the conditions don’t last for long.

If temperatures drop drastically the aloe vera plant will be stressed due to the prolonged cold.

As winter is fast coming, the temperature at night can be quite low. This could be one reason for why the skin is now appearing with brown spots.

Quick Solutions:

The temperature that we are used to in our homes is usually suitable to the development of aloe vera.

But, there are some adjustments that must be made to prevent the stress of temperature on your plants.

  1. Curtains should be drawn during the evening. The temperature typically decreases in the evening, so ensure you use the curtains to shield your aloe from the cold that is radiating from the window glass.
  2. Add extra light. Light produces heat, which will warm the plant. In colder weather ensure that you have an additional source of light to your aloe.
  3. Reduce the amount of watering. The plants will lose less water when temperatures are cold. The reason is that evaporation occurs at a slower pace. Keep your aloe healthy by not adding additional moisture.
  4. Beware of cold drafts. Your cooler or air conditioner could be near the aloe tree. Take your plant out of the area.

Pest Infestation

Although it’s not an everyday occurrence however, the cause of the brown spots that you notice on your aloe could be due to insects.

They do draw unwanted organisms, like mealybugs and aphids. They feast on the soft leaf of the aloe plant, sucking them up and with a smear of lint afterward.

The small lesions turn to brown after a while. If the aloe plant is infected heavily the spots will become more brown. be apparent.

Quick Solutions:

Pests that infest house plants are usually easy to control. Here are a few easy options to consider.

  1. Spray them with water. Apply a small amount of pressure to remove the insects from leaf surfaces. Make sure to allow the leaves to dry before bringing it indoors.
  2. Clean it up using alcohol. Utilizing a cotton ball that has been that has been soaked in rubbing alcohol and wipe off the affected areas. This will eliminate the insects.
  3. Apply the horticultural oil. The diluted neem oils combined with insecticide soap can work magic. It is advisable to keep a bottle of this solution that you can spray on the plant parts that are that are afflicted by insects.

Fertilizer Problem

Aloe vera isn’t an extremely heavy feeder, so it doesn’t require much fertilizer. In fact, it can thrive even without constant use of fertiliser.

Overfertilization could be a risk that could cause dark spots to the aloe’s leaves.

If you’re heavily dependent on organic fertilizers, there is a chance that your soil will form an outer crust due to the build-up of salt.

The salts can draw away liquid from roots, making it difficult to move the nutrients required by plants.

In the end, the aloe plant will suffer leaf burns and root injuries. In the worst case it could end up dying quickly. (source: University of Massachusetts Amherst)

Quick Solutions:

Overfertilization can sound frightening at first However, there are ways to protect your aloe from this ailment.

  1. Remove excess salts using water. By applying six inches of water, you will take away half fertiliser salts. It is possible to repeat this process throughout the day, allowing a sufficient time for the water to evaporate.
  2. Avoid fertilizing your aloe. In some instances, it is better not to fertilize at all , especially when your plant appears healthy. If fertilization is required make sure to do it no more than once per month.

Poor Air Circulation

Insufficient air circulation causes excessive humidity around plants.

For species that are tropical it is advantageous because they require a humid climate to flourish. But, this is not ideal for succulents such as aloe vera.

A lack of air circulation could hold more moisture within the atmosphere. The Aloe Vera plant is likely to have trouble release its own moisture into the air since it’s already soaked.

Quick Solutions:

Air circulation issues are quite easy to fix. Here are some things you can do to fix it:

  1. Make sure you have enough space the space between plants. If your aloe vera has been placed in a group with other plants, particularly those that are tropical, it’s time to remove it from the group. Put it in a place that is away.
  2. The windows should be opened. Let fresh air flow into your home. This will help to improve airflow.
  3. Make use of the exhaust fans. If you’re having trouble getting fresh air since there’s no ventilation and exhaust fans, then one could be a great solution. Switch it on.


The high humidity can be detrimental for aloe vera. Be aware that it’s a succulent which is more accustomed to dry conditions.

The high humidity can slow the rate of transpiration of the plant. This makes your aloe more susceptible to rotting.

In addition the humid environment can increase the development of pathogens. The plant then becomes more prone to disease.

Quick Solutions:

To keep your aloe vera plant from being afflicted by the negative effects of excessive humidity, we have a few strategies you can apply.

  1. Find a warm and dry place. The location you put your aloe vera plant will matter much. To prevent excessive humidity make sure to keep your aloe plant in kitchens or in the bathroom.
  2. Be sure that it is receiving the bright lighting. Light helps the plant lose more water.

Improper Watering

One thing to keep in mind when dealing when dealing with Aloe vera is the fact that this plant is stuffed with a lot of water within its body.

It’s soft and has fleshy leaves, which means it can endure prolonged dry spells. The constant watering of your aloe is not the best practice.

A lack of water is the main root rot that affects every plant, including aloe vera. Roots damaged by rot cause inadequate transport of water and nutrition to leaves. Therefore, it’s not a surprise that the cells in those leaves will eventually die.

Quick Solutions:

If you find that your aloe vera plant is being harmed by excessive watering Here are some tips that you could do in order to help the plant.

  1. Let the soil dry. Aloe plants that have been overwatered will develop soggy and wet soil. It is important to make sure that the excess water that is in the soil will quickly evaporate when exposed to sunlight.
  2. Refrain from the watering for a minimum of two weeks. The roots will require time to heal from the strain caused through the excessive amount of irrigation. Be assured that the aloe will not be averse to dry spells.
  3. Repot if necessary. There are instances where the effect of water overflow is significant and you have to move it into an appropriate container.

Make sure to trim the roots that are damaged prior to plant them in an potting mix that is well-drained.

Frost Damage

The aloe vera stems are full of water. This is the place where they store additional moisture to withstand the long periods of dryness. But, this water could be more likely to freeze in cold temperatures.

The rapid freezing of water in the leaves can cause damage to the tissues that make up the plants. This is why you’ll notice some parts becoming brown. This means that the affected areas have died from the damage caused by frost.

Quick Solutions:

There’s no way to redeem yourself when the plant is damaged by the freezing. The affected parts will definitely be dead. However, that doesn’t mean that your entire plant will go down too.

Here are some suggestions to preserve what’s left of your aloe plant following the frost.

  1. Cut off the damaged areas. The leaves that have turned brown because of the frosting must be removed. They’ll eventually begin to rot.
  2. Move your aloe. Find a place that is warmer to plant it. Avoid areas that are extremely low, especially at night.
  3. Create a cozy environment. Wrap your living vera in blankets or sheets of cotton to keep it warm.
  4. Turn on the artificial light. If the temperature is low in the daytime and there’s not enough light coming through the solar rays, make use of the light in the room to help dispel the chill inside.

How to Prevent Brown Spots on Aloe Plant?

Understanding the various reasons for brown spots on your aloe, you are aware of what you must and shouldn’t do when caring to this plant.

Let’s look at some of the most effective methods to stop the recurring brown spots.

Select the most suitable plant material.

Begin with plants that are healthy. Choose one that appears robust in appearance. The leaves should have an intense green color, without any evidence of blemishes.

Do not ever choose a diseased aloe vera. It could cause further problems later on.

Always provide bright light.

Light can do a lot for your Aloe. In addition to helping your plant grow food, it also assists in speeding up the rate of transpiration and boosting the temperature and also making the environment dry.

Aloe vera is a fan of dry places. Make sure that sunlight exposure is indirect. We all know that excessive light isn’t good for us.

The water should be drained thoroughly, but not often.

The Aloe plant doesn’t require an everyday drink. It is not thirsty often however, when it does it requires a stoke. Be sure to soak the plant in water thoroughly so that it can replenish its reservoir of water.

In the case of aloe vera, think of filling a drum with water. When the water has run out then you fill it to the top. Then, you wait till the container is nearly empty.

Get ready for the cold winter weather.

Aloe vera is extremely delicate to temperatures that are cold. The leaves are delicate and can easily be damaged when frosting. If the weather is changing ensure that you are prepared to shield your aloe vera plant by moving the plant, getting a supplementary lighting source, covering it with insulators, similar.

Opt for organic fertilizers that release slowly.

Overfertilization is often a result of making use of readily available fertilizers, like inorganic ones. Because aloe vera isn’t an extremely heavy feeder, it can thrive even with lesser fertilization. The best thing to do is to incorporate slow-release fertilizers into the soil.

Organic fertilizers that slow release nutrients are a good source of nutrition. Because they aren’t readily available, it may require some time for the nutrients to be released into the soil. This way, the risk of salt accumulation is avoided.

There is no misting or overhead watering.

Aloe vera isn’t going to be happy with the extra water. Keep the misting for the tropical plants in your home. Make sure your aloe plant is in a dry condition as much as you can.

A humid and humid environment isn’t good for the aloe. Make sure it is kept at a low level so that the plant doesn’t rot and get sick.

Take it out from time to time.

It is recommended for your plant to be exposed plant to an outdoor environment in the summer when the weather is nice. Allow it to enjoy the sun’s rays (not longer than 6 hours). Let it breathe in pure air.

It is possible to do this between May and September, when the weather is usually mild. Then, you need to bring your aloe plant indoors in the comforts at home in order to stay out of the freezing temperatures.

Be sure to keep the insects away.

While aloe vera isn’t often infected by insects, we can’t ignore the possibility that they are in the vicinity.

It is a good idea to check your aloe regularly for signs of mealybugs or aphids. It is best to identify and eliminate them when they are small and manageable.

If you can you can, stay clear of using toxic chemicals like insecticides and pesticides on your home plant.

We don’t want to put our health at risk in order to keep these insects from our homes. They can be controlled with the home solutions instead.

Make sure to use a clean, well-drained and disease-free potting mix

Aloe vera is a great choice in a potting mix designed for succulents and cactus. The mixes drain well and you can be sure that water will not become stuck inside the container.

Don’t overlook to select the mixture that has been sterilized previously. This will ensure that there is no risk of developing a soil-borne disease. A healthy soil is essential for an enviable plant.

Maintenance and care of the aloe vera plant is very simple when in comparison to other houseplants.

If you have any issues like brown spots on your leaves, you should investigate the possible reasons. If you do, you’ll be able to solve the issue.

Remember that aloe vera is a sturdy plant. Therefore, it has an excellent likelihood that it will beat the odds. Best of luck!



Went from a bad gardener to a half-decent one over 10+ years. Super happy to share my tips and tricks with you :)