Why Are the Leaves Turning Brown on My Alocasia?

Alocasia is a beautiful and lush form of a houseplantthat is admired by its stunning stingray-like leaves. Alocasias generally do not have any problems however, they aren’t resistant to the common problems.

If the leaves of your alocasia have begun to turn brown, I’ll assist you to determine the root cause and show you how to bring the plant back to full health.

The most frequent cause for alocasia to turn brown can be traced to leaf scorch. It could be caused by sunburn or fertilizer burn, root rot, or excessive watering. Other causes for alocasia brown leaves are diseases, insects and inadequate nutrition, low humidity, and inadequate air circulation.

I’ll go over each of these issues in order to determine the root reason for browning of your Alocasia plant. Learn how to correct every issue, and more.

Causes of Alocasia Turning Brown

If they’re healthy, alocasias have massive, striking dark-green leaves that have zebra-like veins. They’re native to the semitropical and tropical regions in Asia-Pacific. Consider the Philippines and the Philippines, they’re more comfortable in humid climates.

But you might not be able to turn your house into a tropical paradise. This is when the problems start to begin to appear. A common problem is the browning of alocasia leaves.

Could it be due to an illness? Bad watering habits? Perhaps exposed to temperature fluctuations?

The first thing to do is not be afraid to panic. You can determine the issue by examining your Alocasia. Find out how you can fix each possible root.


Alocasia likes to dry out slightly, but it isn’t done before it’s next time to water. It thrives in moist soils, however excessive watering is not a good idea. A soil that is waterlogged can be an ideal environment for root rot, especially when the potting mix is not properly drained.

Root rot can hinder the oxygen absorption process. Roots that are sick, in turn can affect other parts of the body such as the leaves, which eventually become brown.

Check out the following clues that water overdosing could be the reason for alocasia browning:

  • Tipping Tip: The tips of leaves first turn brown because of root rot.
  • The smell of rotting food is emanating from the soil of the potting is a telltale indication of root decay.

How to Fix

It is essential to take care to treat the fungal infection as soon as you notice because it can spread quickly. I’ve followed the steps below to treat browning of alocasia caused by overwatering:

  • Take your alocasia out of the container and look for any signs of root rot.
  • The roots that are affected by disease tend to be fragile, mushy and black or brown. They can emit an unpleasant smell. Remove the rotten roots with a clean pair of scissors or pruners.
  • Get rid of the soil around healthy roots. Rinse off the rest using water.
  • The healthy root system should be dipped in a solution that is anti-fungal. If you prefer natural methods sprinkle them with crushed cinnamon. Or dip roots in hydrogen peroxide solution.
  • Repot your alocasia with fresh, well-drained pot mix. Make sure the pot is big enough.
  • Place your alocasia in a bright indirect light.

small Alocasia variety in white pot


Alocasia with brown leaves could be a sign of an infection caused by a parasite, bacterial or fungal infection. Bacterial leaf spots typically smaller, but they are larger and have an appearance of wet.

The fungal disease usually begins with small brown spots. If they’re not treated the spots will grow and then bleed into one another. They’ll appear to be an enormous streak of blood.

Be on the lookout for the following illnesses which cause the leaves of alocasia to change color:

  • Pythium rot – This arachnid disease can affect alocasia in a severe way and abruptly. Pythium rot starts as tiny circular spots (roughly 2 to 5 cm). They expand quickly and reach up to 15 centimeters in the diameter.
  • Phyllosticta leaf spot – Early signs are tiny circular or oval spots. They expand and, when there are many spots, they will join. Spots can appear as beige or gray, and then change to black or brown. In any case, they could collapse and leave scuffy holes within the leaf.
  • The Xanthomonas bacterium that causes leaf rot first appears as small dark brown spots. Later on they turn necrotic brown, and then merge into irregular streaks.
  • Anthracnose is a cluster of fungal diseases that affect the roots or leaves of your Alocasia. The result is light spots on the top leaf’s surface and brown spots reminiscent of rust on the bottom.

How to Fix

Get treatment immediately to increase the chances of the chance of survival. The most effective treatment can differ according to the specific condition. In general, you should:

  • Separate and quarantine plants that are ill.
  • Cut off the diseased leaves, roots, and other components.
  • Avoid watering overhead. Make sure to water your alocasia at the base at dawn. Ensure ample air circulation.
  • Apply Bordeaux mixture Anti-fungal, anti-bacterial or any other antimicrobials you require.
  • Instead, you can spray your plants with the oil of neem, tea tree oil, as well as baking soda.


Alocasias thrive in moist soils, however there could be too many good things. Alocasia plants that are overwatered can absorb excessive amounts of water. The cells can become so overloaded with water that they break.

It’s usually manifested as bumps or watery blisters on the underside of leaves. The blisters eventually dry up and leave corky brown or tan spots. Other indicators of edema are lifeless, drooping or leaf shriveling.

How to Fix

Oedema isn’t a sign of an illness or disease. The best method to treat it is to pinpoint the root cause and treat it in the right way. I’ve come across the following strategies to revive alocasias with edema:

  • Change your watering routine. I like morning watering or controlled drip irrigation. Avoid warm water as it is more quickly absorbed.
  • Aeration is crucial. It is important to ensure that there is enough space between the plants.
  • Increase the intensity of the light but avoid direct sunlight. This can help speed up transpiration.

Rust Spots on Alocasia Leaves

The fungal disease which has infected alocasia as well as many different indoor plant species. It is particularly invasive in humid, warm conditions. Insufficient light could also be the cause.

In the beginning, spots of rust are tiny like rusty spots in red or brown on the leaf’s underside. They may also be or are. An abrupt increase in temperature could trigger rapid growth. The spots can transform into massive pustules that are ragged.

If not treated, the leaves that are brown will fall. While it is usually an aesthetic issue however, the leaves could eventually die and wilt.

How to Fix

The rust spots on the leaves of alocasia thrive in a humid, warm environment. Therefore, it is recommended to:

  • Check that the leaf surfaces are dry to the extent they can be. Avoid watering overhead. Instead, choose drip irrigation or base watering, or make use of an encased hose.
  • If you can, drink water only at the beginning of the morning.
  • Remove decaying, diseased, or dead plant matter that is decaying, diseased, or dead.
    • Use copper-based fungicides, Neem oil, and baking soda.

Pest Infestation

Pest infestation is a major cause of leaf browning in Alocasia. Mealybugs and other insects can be especially invasive. They can cause serious damage to leaves and leave a trail of brown spots on the leaves.

Be aware that mealybugs and other insects in this family love to attack all things, from stems to roots and leaves. But, some insects concentrate on leaves. They include leafhoppers, aphids scales, spider mites and real bugs.

In this case bites from them will cause damage and stripping on the leaves. The leaves may also change color around the edges and veins.

How to Fix

Utilize the following strategies to get rid of a pest:

  • Bring your plant to the shower or bath.
  • Use water to blast it to eliminate bugs.
  • Spray with insecticidal soap oil for horticulture, or other insecticides such as Neem oil. Repeat every week until you have eliminated the insects.


Alocasia is a good candidate for moderate to bright indirect light. Excessive sunshine, direct heat, or extreme temperatures may result in damage to the tissues. The affected areas usually develop to brown blisters.

Sunburns are also possible when you hurry your alocasia from an area of darkness to a brightly lit area. The excessive exposure to sunlight can trigger an increase in damaging free radicals. If the problem isn’t rectified, leaves will begin to appear scalded or bleached before turning brown.

Drooping, curling, or wrinkles in leaves can also be a indication of sunburns. Apart from the browning of the tips of leaves You can also see some leaf paleness and yellowing.

How to Fix

  • Take your alocasia out of direct sunlight as soon as you can. Most of the time this will mean moving the plant’s location from a window facing west to one facing east.
  • Avoid heat drafts. Remove your plant from the HVAC unit or heating vents, or else it could be exposed to excessive heat.
  • The damage caused by sunburn is usually irreparable. Take away plant materials that are damaged to avoid rotting and infection.

Low Light

Alocasia plants are most content in bright, well-lit areas such as windows with an east-facing view. They are awe-inspiring in mid-to-bright indirect sunlight. This is because they are sensitive to low light.

Poor artificial lighting, dark rooms or areas that are not well-lit are not conducive to healthy growth. The lack of light does not cause browning of the alocasia leaves directly.

The slow growth can increase the chance of root rot, nutritional deficiency as well as overwatering and edema. This can cause leaves to brown.

How to Fix

  • Find a spot with good lighting that gets indirect sunlight to your Alocasia.
  • You can get a top-quality light meter application. There are dime-a-dozen available on the App Store as well as Google Play.
  • If nutrition deficiency has set in, fertilize your plant accordingly. This is also true for root rot, overwatering, and edema.

Temperature Stress

Alocasia plants can thrive in temperatures that range from 60oF (15oC) and temperatures of 82oF (28oC). But, it is important to keep temperatures within the middle of this temperature range.

Alocasias are particularly susceptible to stress caused by temperature, both hot and cold drafts. They don’t just shock the plant, but they can result in tissue injury. The result is not pretty curly hair, brown coloring and fallen leaves.

Other indicators of stress due to temperature on alocasia are:

  • The appearance of pale, tan, and yellow-colored leaves.
  • Browning on leaf tip.
  • The leaves are sulky and can be wilting and then fall over.
  • Mix of extra dry soil.

How to Fix

  • Examine the surroundings of your Alocasia. Are there cold or hot draft?
  • Remove your plant from radiators, cooling vents, and windows that leak.
  • Keep temperatures at or below 60s at night, and increase it up to the mid-70s in the daytime.


Alocasia is a subtropical and tropical plant. In simple terms it’s designed to thrive in humid, warm conditions. If the humidity is low the plant will dry out, and discoloration will show in the leaf.

In reality, the appearance of brown tips and veins are an obvious sign that there is a low level of humidity. This is especially true in winter, when there’s not enough humidity in the air that is crisp. Convection heating systems could make things worse.

A high level of humidity can cause similar negative consequences. It can create a favorable environment for fungal infections such as edema, edema, as well as root rot. All of them can cause leaf browning.

How to Fix

  • If your home is dry, offer your alocasia a daily misting.
  • It is possible to spray your plant lightly every month or in the summer months using your garden hose.
  • In winter, place your alocasia in a moist space, such as the bathroom.
  • Make sure to water well, maintain adequate air circulation and put non-infected plants in order to increase humidity levels.
  • Make use of a tray for water that has pebbles in it to make a moist microclimate around your Alocasia.

Frost Damage

If the leaves of your alocasia have turned yellow or brown it could be frostbite that is the cause. It is an exotic plant that thrives in more humid conditions. Actually, it performs especially very well within the middle temperature zone that is between 60oF (15oC) and the temperature of 82oF (28oC).

Alocasias aren’t tolerant of frostbite. If temperatures drop lower than 55oF (13oC) the cells go into hibernation and then become denatured if temperatures fall even below. Frostbites can also shock plants and can cause tissue damage to cells. The damaged areas will appear as brown bumps.

How to Fix

  • Make sure your alocasia is protected from cold drafts, like un-sealed windows.
  • Make sure they’re in a temperature-controlled room. It’s possible to avoid the patios and conservatories during winter , unless they’re heated.
  • Make sure that temperatures remain at the higher end of the spectrum – i.e. within 60oF (15oC) and 82oF (28oC).

Lack of Nutrition

The ideal situation is for alocasia to be fertilized every month from early spring until the end of the summer. Based on the location you live in it is possible to fertilize well into the fall. If you don’t fertilize, the leaves will begin to turn due to a deficiency in nutrition.

The most frequently lacking nutrients include nitrogen, zinc, iron, and magnesium. In all four instances leaves change from black to yellow. Other indicators of a deficiency of nutrition are slow growth and mottling, necrosis and chlorosis.

How to Fix

  • If the yellowing is predominant over browning, sulfur or nitrogen may be lacking. Make sure that the plant is in a well-lit, but indirect light. Make sure to use a nitrogen-rich fertilizer for your houseplant.
  • The majority of deficiencies in nutrients can be addressed with an organic and fresh potting mix.
  • Be sure to fertilize each month beginning in spring and continuing through the fall. Follow the dilution and administration guidelines provided.

Fertilizer Problem

Browning leaves of alocasia can be an indication of the buildup of fertilizer salts. The buildup of chemicals can result due to the softening of (tap) water , or over fertilization over a long period of. If you do not add enough water, it can get worse.

This is one reason why it’s recommended to repot your plants with new soil every few years. The softened water may also make the tips of leaves brown, so you should consider using the water that is distilled or filtered to ensure your plants are happy.

How to Fix

  • Remove any fertilizer salt that is left in the mix of potting.
  • You might consider using a water filtration system or distillation.
  • Apply fertilizer sparingly, but only once per month , spring-fall.


Most of the time the leaves that turn brown indicate that the plant is underwatering. It requires a constant flow of water to flourish. If it is left to dry for a long time the alocasia that is underwater will begin to shrink, fall over and wrinkle its leaves and eventually die.

The only way to determine whether underwatering is the reason is to examine your potting mixture. If it’s wet (2-4″ in topsoil) The plant is dehydrated.

How to Fix

  • The best way to treat it is to supply your alocasia with sufficient water.
  • A quick watering at dawn is recommended.
  • Do not overwater your plants; this can cause more harm than good.
  • Check to see that the 2 inches of topsoil have dried slightly prior to the next watering.

How to Prevent Browning of Alocasia Leaves?

Finding the culprits that could cause browning in alocasia is only half the fight. The second half of the battle is doing what’s necessary to stop them from happening.

Watering Problems

  • Check that the top 1-2 inches of soil dried out slightly prior to the watering.
  • Only water your alocasia every morning. Also, as often as you need in warmer weather.
  • Check the roots frequently for any signs of root rot.


  • Make sure you have good air circulation and keep your houseplants separate to stop the spread.
  • Make use of the drip irrigation system or sprinkle water near your plant’s base.
  • Beware of excessive watering.
  • Get rid of infected plant material as soon as possible.

Fertilizer Problems

  • Beware of over fertilization by applying fertilizer every month beginning in spring and continuing through the fall.
  • Repot with a new soil mix every 2 to 3 years.
  • Avoid softened or tap water, which can aggravate salt build-up.


  • Make sure your alocasia is protected from cold drafts.
  • Do not place your plant in a location in a place where temperatures are lower than 55oF (13oC).
  • Do not let your alocasia get into windows.
  • Plant indoors to create an environment that is warm and inviting.


  • Keep humidity at or at or above 60%, but at or around 70 70%.
  • Alocasia is a great place to mist it daily in winter and during low humidity conditions.
  • Utilize pebble-filled water trays in order to increase the humidity.
  • Place your plants in a group to create a moist microclimate.
  • Find an air humidifier.


  • Protect your alocasia away from direct sunlight.
  • Avoid positions with low light and. Sudden relocation may cause sunburns.


  • Fertilize every 3 months using calcium and potassium Nitrate to help strengthen cell walls.
  • Be careful not to overwater, particularly in winter.
  • Do not use hot water to water.

Rust Spots on Alocasia Leaves

  • Check that your alocasia is properly aerated.
  • Make sure you keep a space between your plants in your home.
  • Quarantine affected plants immediately.

Low Light

  • Place your alocasia near the window sill.
  • Expose your eyes to indirect but bright light.
  • Utilize apps for measuring sunlight to determine the intensity.

Pest Infestation

  • Check your alocasia regularly for insects, particularly the leaf’s back.
  • Clean containers and mix for potting.
  • Do not allow the leaves of different plants get in touch with each other.
  • Bright (indirect) lighting, regular irrigation, and proper air circulation will stop the majority of insects from invading your spider plants.

Temperature Stress

  • Do not place your alocasia too close to heat, air, or vents that are cold.
  • Beware of direct sun.
  • Maintain a consistent temperature in the indoor space within the range of 65degF (18degC) and 85degF (29degC).

Last Words

The most frequent causes of browning in alocasia is diseases, rust spots, fertilization burn, overwatering as well as low levels of humidity. It is possible to revive your plant by addressing the problem.

Aeration that is properly done, good practices for watering, the right temperature, indirect light and a healthy humidity level should avoid the majority of these problems.



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