What Made Brown Spots on my Spider Plant Leaves?

The spider plant is a classic favourite among houseplantsand with good reason. I like that they’re easy to cultivate, can withstand the most intense light conditions, and aren’t fussy regarding water. However, they are susceptible to some problems, such as the appearance of brown spots.

The most frequent reasons for brown spider plant spots are Fungal disease and burns from fertilizers. Additionally, physical disorders such as edema, nutritional deficiency and scorching may cause this issue. To bring back your Spider plant, remove severely ill parts and apply fungicides when required.

I know that seeing brown spots on your gorgeous, lush and vibrant airplane plants can be quite a bit of a shock.

But don’t panic. I’ll help you solve the issue and bring the house plant back into its normal state. Also, keep an eye out for methods to stop it from happening in the first place.

What Causes Brown Spots on Spider Plants?

If brown spots appear on your plants, it’s the most obvious sign that something’s wrong in the spider plants you have.

They can develop in different ways based on the reason, extent, and duration of the browning. They can differ in texture, size and even the shade of brown.

Brown spots are most prominently seen at the ends of the plant, but they can be found throughout the foliage. Certain spots grow larger and others are just barely visible. They typically appear initially as blisters, but they eventually transform to dry lesions.

In any situation, knowing the precise reason for those brown marks on the spider plant will assist you tackle the issue more efficiently.

It is important to examine your plant carefully to identify the issue. Also, consider the conditions your plant has been exposed to in recent times.

I’ll show you the steps to recognize every common cause of brown spots on spider plants. Learn how to fix every one of these common issues that can cause your houseplant to go brown.

plant in dappled sunlight

Fungal Diseases

If you maintain the plant in excessively humid and hot environments The reason for brown spots is almost always a fungal ailment.

They usually begin as greenish spots that appear particularly on the leaf’s tips. They then gradually change to brownish. In certain instances spots, they can go completely black.

Below are some of the frequent fungal diseases that can cause brown spots on spider plants:

Downy Mildew

The fungal infection is caused by parasitic algal organisms. It is soft, fuzzy brown growth. It is most noticeable in the lower leaves of a spider plant , but could also show other signs like leaf streaks, leaf drooping or slow growth.


The most severe symptoms occur when it is humid and warm This fungal leaf blight is most prevalent in mature leaves. It usually begins as small brown spots with yellow halos, and then transform into brown spots that are irregular (around 3/4-inches). The leaf that is severely damaged may become wrinkled, wrinkly or even collapse.


The leaf spots that are caused by Anthracnose typically begin as small brown or yellow spots that develop to dark brown spots.

Septoria Leaf Spot

The fungal leaf spots appear on the undersides of mature leaves as a little round spot with a gray central area and a dark brown border. If you don’t take care of it for a long period of time the leaves will turn yellow and then wither.

Powdery Mildew

As a novice (that was quite a while back! ) I would confuse powdery mildew with downy mildew. This kind of mildew thrives in humid, cool conditions.

Powdery mildew is distinguished by spots that begin as white patches, which eventually transform into yellow-brown spots typically appearing on the upper edges of leaves.

How to Fix This

There are a variety of methods to treat fungal illnesses:

  • Do not water the plants for a few days to eliminate excessive moisture that causes growth of leaf spots.
  • Plant your houseplants in a bright area and spread them out.
  • Avoid watering overhead. It is recommended to keep the leaves relatively trocken by spraying water to the base.
  • Utilize copper-based fungicides from the first sign of obvious signs of fungal illness. I’ve found that fungicides that include chlorothalonil, neem oil myclobutanil, lime-sulfur or mancozeb could help.

To treat Fungal illnesses. These are the fungalicides I suggest:

Algal Leaf Spots

If you keep your houseplant in a hot, humid location, it could be infected with algae parasites known as leaf spot caused by algae. It is usually transmitted between plants another through rainwater, but it can also be carried indoors by winds.

If your plant’s spider has an algal leaf spot disease you’ll notice rough mesh-like brown or greenish-brown spots on the affected leaves.

The size of each blotch is approximately one-half inch. However, multiple blotches may merge creating what appears to be an even larger the blotch.

I’ve noticed that algal leaf spots are most common on younger, soft leaves. There is also an appearance of stunted on tips as well as stems and other parts. They usually begin as tiny circular spots of pale green before transforming into massive brown-reddish lesions.

How to Fix This

The majority of cases of algae leaf spots are little something more than just a cosmetic problem because they can cause your plants to look ugly.

But, they’re not always fatal unless the problem is so extensive that it covers almost the entire spider plant. It is possible to eliminate the leaf spot infection caused by algae by using non-chemical techniques like:

  • Do not water for long periods of time as moist conditions can cause the growth of algae leaf spots. Therefore, it is important to keep your plants’ foliage as dry as you can. If you have to water it make sure to do it near the base of your plant. Place your houseplants in a broader area to increase the airflow.
  • Remove plant material that is severely affected Remove any foliage that is dead or severely affected to stop the spread of the algae.
  • Chemical application – If you need to control an infestation that is widespread apply copper fungicides. Apply each 10-14 days, until you’ve rid the plant that is the home of this Leaf spot disease.

Bacterial Diseases

If you see sunken, dark brown or watery spots or lesions in your plant’s spider, you could be suffering from an infection caused by bacteria.

The houseplant you have will probably develop leaf spots caused by bacterial when it is kept in an area that is not well ventilated. Insufficient humidity and overwatering could exacerbate the condition.

How to Fix This

There is no treatment for plants that are that are affected by the bacterial leaf spots. Spray them using a baking soda solution and also use sulfur-based or pyrethrum-based sprays. They will stop the spread of disease, but they won’t heal the affected areas.

Bacterial leaf spots could cause death for your home plant. If the disease is widespread, it is important to eliminate the affected parts before spreading to healthy leaves.

Place your houseplant in a well-lit and well-aerated area will go a far. Beware of overhead irrigation and.

Nutrient Deficiency

If your spider plant is covered in brown spots, your houseplant could suffer from deficiency of nutrients. It could be due to root decay or a wrong lighting source or inadequate soil nutrition.

The leaves of spider plants that are that are low in nitrogen tend to change color prior to developing spots of brown. If all else appears to be fine aside from the browning of the tips of your leaves, this could indicate that your houseplant is iron deficient.

The deficiency of magnesium or zinc can be seen by brown spots on the foliage close to the middle.

How to Fix This

Ideally you should use fertilizers on your spider plant each month during spring and summer. Water-soluble fertilizers are strongly advised. Avoid fertilizer burn as it can also lead to brown spots.

In the event that brownish spots are a sign of a deficiency in nitrogen Try placing the plant in a more bright space to see if the spots disappear. If you suffer from iron deficiency, one application of fertilizer containing iron is enough.


A lot more common than gardeners would like to admit the condition is called edema. It’s that causes the houseplant to take up much more fluid than it needs. The leaf cells are then able to expand and break.

The rupturing can result in bumps, watery blisters or spots, particularly on the undersides of leaves. They’re usually wart-like, crusty bumps that can become necrotic. They can be confused with fungal or bacterial leaf spots.

How to Fix This

There are a variety of methods to deal with brown spots on spider plants caused by edema, based on the root cause of the problem:

  • If the problem is due to poor watering practices, discontinue watering for a couple of weeks or till the upper inch the potting soil has dried out. Take water trays off and make sure that the large pots are properly drained.
  • Increase air circulation and water flow when the sun is out and warm. Move your houseplant gradually to a brighter area.
  • Conduct a soil test and alter the pH of your soil and the nutrients in line with.

Excess Light/Scorching

Excessive light exposure could cause stress on the spider plant. The houseplant should be placed in a sunny area and placed in a well-lit area. Do not rush the plant out of a dimly lit space to a bright spot.

To ensure optimal development the spider plant must be kept at temperatures that are between 70degF (21degC) between 70degF (21degC) and 90degF (32degC). A lot of light won’t just shock your houseplant, but it could cause tissue damage, which is often manifested in the form of brown spots.

How to Fix Brown This

The solution is easy move your houseplant away from hot and humid conditions. Transfer the plants to a location which receives indirect, bright sunlight. Avoid any direct sunlight as it could cause scorching.

Frost Damage

In addition to excessive or scorching light, cold drafts could cause tissue damage to your houseplant and result in brown spots appearing. It is typically seen at the beginning of winter.

If your houseplant is close to the window, check whether there’s a draft of cold air especially in the evening. It’s also commonplace for spider plants that are not heated sunrooms and conservatories.

How to Fix Brown This

Moving the plant in a more shady location will work. Be sure that your spider plant is well-insulated or keeps the room warm. Simply switch on your heating unit, but keep temperatures in the 70degF (21degC) and 90degF (32degC) range.

Low Humidity

Spider plants thrive with moderate humidity (somewhere between 30% to 50 percent range).

A combination of too high and low humidity could spell disaster for the spider plant. On the other hand, excessive humidity, particularly when combined with hot conditions can lead to bacteria, algal, or fungal infections.

However low humidity can mean that those leaves on the spider plant will begin to wilt and become brown on the edges.

How to Fix Brown This

The low humidity can be a typical issue during winter. To fix the problem put your houseplant in an area with moderate humidity. It is possible to mist the plant from time to time.

Insect Infestation

Although spider plants are generally easy to maintain, they can be impacted by scales, aphids mealybugs, spider mites whiteflies, and many other insects. They typically make holes into the leaves and then suck up juices and leave brown spots.

How to Fix Brown This

The first step is to examine your spider plants for any indications of an infestation by insects. If one of the insects mentioned above infest your homeplant clean the insects outdoors or inside the bathroom using an intense splash of water.

Watering Problems

The brown spot on plants that are spiders typically an indication that you need to rethink your watering routine. If you’ve overwatered your houseplant and leave it to dry completely prior to the next watering and you’ll end up with brown spots.

The excessive watering can leave the soil of the pots saturated with water. This can make it difficult for house plants to absorb oxygen and nutrients. Instead of dousing it with water, keep a regular schedule of watering.

The spider plant flourishes when the potting mix is dried out a little between watering. Make sure to check the soil each four or five days.

If the soil mix appears slightly dry to the touch Make sure to water the plant properly. Be sure that the water drains through at the base of the container.

How to Fix Brown This

The spider plant flourishes when the potting mix is dried out a little between watering. Make sure to check the soil every five to six days.

If the soil mix appears slightly dry to the touch Make sure to water the plant properly. Be sure that the water drains through at the base of the container.

If your soil is soaked and the root system is rotten, check for signs of root decay. Take out the diseased roots and apply anti-fungal treatment to the remainder.

Move the houseplant into larger pots and then leave the mixture that has been watered until it has dried out a little. Repot the plant and keep an excellent watering routine for the next few days.

Fertilizer Burn

The brown marks on leaves the spider plant can be an indication of fertilization overuse. This is a sign of an increase in salts due to the excessive use of fertiliser. It could also result from softened water.

Spider plants need a bit of fertilizer to help boost their growth. However, just like vitamin supplements and human bodies, excessive amounts of it can cause more harm than good.

How to Fix Brown This

Then water your plant until it emerges from the holes at the bottom. This will aid in removing salts that are accumulating due to fertilizer excess. If the burn from fertilizer is severe enough it may be necessary to plant new soil.

From here, you can fertilize your houseplant with care, at least once a month during spring and summer. The most effective fertilizers for water-soluble plants are those that are designed to spider plant.

You May Also Enjoy: Why is my Spider Plant Dying? (Causes and Solutions)

How to Prevent Brown Spots on Spider Plant?

As you would imagine, stopping brown spots from appearing at all is contingent on the possible reason. I will discuss the steps to stop each issue from creating brown spots on the spider plant.

Algal Leaf Spot

While algal leaf spot is not a major threat to your plant, you’ll like to prevent it from happening by employing the following methods:

  • Make sure the spider plant is sturdy Healthy houseplants are less susceptible to algae leaf spots. Fertilize, water, and take care of your plant when it is needed.
  • Plant your plants in a brightly lit and well-aerated place.
  • Avoid areas that are humid. Plants should be spread out as well.

Fungal Diseases

  • The fungal infections thrive under hot and humid environments, so be sure to avoid them.
  • Separate your house plants to avoid a increase in humidity.
  • Be sure that your plant is located in an area with good circulation.

Bacterial Diseases

Since there is no cure for bacterial leaf spots that are systemic You must eliminate affected plant material immediately to stop the spread. Utilize any method that reduces the amount of water on leaves, increases air circulation, or reduces humidity:

  • Plant your plant in a bright, open place.
  • Create ample space between houseplants.
  • Make sure to water your plants at the base to prevent the leaves becoming wet.
  • Do not overhang other plants in your home over your spider plant.

Nutrient Deficiency

Research has shown that a water-soluble fertilizer having an NPK ratio of 19-6-12 or 2-1-2 is the best for spider plant’s optimal growth.

Place your plant in a sunny, indirect light source to avoid the deficiency of nitrogen. A fertilizer that is rich in zinc, iron and magnesium can be applied only once.

Fertilizer Burn

In the same vein it is important to avoid fertilization that is too high. Applying a water-soluble fertilizer every month or so during spring or summer is acceptable. Beware of fertilizers that contain fluoride or boron.


  • Make sure the mix is well-drained and beware of over-fertilization.
  • Limit watering during periods of low growth and during colder months.
  • Expand the spacing between plants to increase the amount of light.

Excess Light

Avoid direct sunlight as it could scorch the foliage. To get the best results, place the spider plants in an a place which receives bright indirect sunlight.

Frost Damage

Be sure that your houseplant is properly insulated. Place it in a warm location or make sure the room is warm. Cover any vents or windows that could let the cold air in.

Low Humidity

If your room is extremely dry, you can give the spider plant a regular misting. Alternately, you can place your pot over a small tray of water with pebbles.

Insect Infestation

Bright (indirect) lighting, sufficient water and a good air circulation will stop the majority of insects from invading your spider plants.

Watering Problems

Spider plants like the pots to dry up a bit in between the watering. Make sure to check the potting mix every 4 to 5 days to determine whether it’s dry to the extent that it’s dry to the. Make sure to water your plants regularly to prevent excessive watering.

Last Words

The brown spots that spider plants develop are common among the houseplants. They’re usually caused by illness, whether it’s fungal, bacterial, or algal. Stresses from the environment like excessive light and frost, as well as low humidity and excessive humidity can also result in leaf damage as well as brown spots.

Edema, over-fertilization and deficiency in nutrient may be a factor in the formation of brown spots on spider plants.

If all seems fine, however there are brown spots, look for insects such as mealybugs, whiteflies, spider mites, scales and Aphids.

The treatment of brown spots will depend on the root cause. But, a good air circulation and humidity control, as well as adequate lighting and water will keep them from gaining an eagle’s eye on your precious home plants.



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