Why Are My Monstera Leaves Turning Black

Do not be alarmed if you see black spots on your Monstera Deliciosa; they do not portend impending death. If given the right care, the hardy houseplant Monstera Deliciosa can recover from issues like black spots. Here are the seven causes of the black spots on your Monstera Deliciosa.

Black spots on monstera leaves due to insects

Mold on plants can be caused by insects. The insects frequently leave something behind that encourages deterioration. When mold grows on Monstera leaves, the leaves turn black. Any portion of a plant can develop mold, and under the appropriate circumstances, it can even flourish in the soil. Mold can also grow as a result of excessive leaf moisture. With pristine gardening shears, the contaminated leaves are cut off the plant. When a Monstera plant’s leaves start to turn black, clip the leaves and clean the scissors between cuts to stop mold growth.

Pests

Despite Monstera’s high pest resistance, an army of six-legged, leaf-eating insects occasionally overwhelms the plant. I’ll relate my experience because I’ve had spider mites and thrips in the past. These aphids leave behind tiny, unattractive black dots after feeding on your plant’s leaves.

The monsteras will quickly spread throughout the plant and attack any extra evergreens or monsteras you have, despite your initial impressions to the contrary.

Spider Mites

removing plant’s sap from the leaves With time, that sucking spot transforms from dark yellow to brown and then to black. Check to see if there are any mites underneath the leaf. You’ve undoubtedly located the pests you’re looking for if you notice any black spots moving on the underside.

Thrips

are small, leaf-sucking flies that deplete the water supply in your monstera. They also cause leaf yellowing and surface black spots, just like mites do.

You may easily remove the mites with a water jet. Just be careful not to hurt your plant. A warm shower will do if there aren’t enough spider warriors available. Neem oil is what I like to use to get rid of thrips.

It is a pure oil made from the neem tree’s seeds. Use a spray every few days, and in less than a week the bugs will be gone.

In order to stop the spread of mold, you should also trim the leaves of Monstera when they turn black.

Monstera leaves turnng black due to fungal disease

When it floods, fungus diseases frequently affect Monstera plants. The leaves of Monstera plants will become yellow, brown, or black due to fungus diseases like leaf spots. The leaves may also develop tiny black spots, which are signs that fungus spores have grown.

If you don’t treat the plant with a fungicide to get rid of the fungus, it will keep spreading. After you’ve gotten rid of the fungus, fertilize to improve the soil.

Monstera has black spots due to Dehydration

On the other extreme of the watering spectrum is dehydration. In contrast to overwatering, underwatering is a gradual killer. This process takes longer to develop than overwatering because of the monstera’s thick leaves. The dried plant doesn’t contain enough water to moisten each part.

Because of this, the furthest away leaves show the earliest signs of blackness and crispness. Lack of water puts plants under stress, causing palisade cells to die. Juvenile leaves get more water since they are nearer to the stem.

If your monstera has dark patches all over her body and is sad and droopy, buy her a drink! I suggest pouring water into the container’s bottom and allowing the soil soak it up. If this does not work, your soil may have become hydrophobic. It’s just another way of expressing “it hates water.”

This occasionally happens, particularly if you keep your plant in direct sunlight. Relocating the plant should be done as soon as possible, ideally in a larger container with brand-new soil.

Dry Soil

The soil can quickly get to the point of being completely dry when exposed to a strong indirect light source. Black stains on stems and leaves aren’t directly caused by dry soil, although it does encourage the growth of other illnesses. Poor soil may have a low capacity for water retention, which can lead to poor absorption, dehydration, and a number of nutritional problems.

Poor light regulation usually results in dry soil. Before planting (or replanting) your monstera, you must protect the soil from excessive direct or indirect sunlight. It dehydrates and turns hydrophobic.

Another reason for dry soil is poor drainage. If you select compact soil that is high in clay, water won’t be able to get through it, leaving the root zone dry.

Make sure your soil receives just enough water and is exposed to indirect light. If the soil is too dense, try adding some gravel and stones to the mixture. A gravel and pebble blend, according to study, can enhance soil drainage and help maintain the soil’s temperature and humidity levels.

Repot your monster in a container with top-notch, humus-rich soil if you think the current soil is beyond saving. Black stems and roots could also become an issue. I strongly suggest repotting your plant in this situation and moving to a soil type with good drainage properties.

Issues with TemperatureCold Temperatures and Sunburns

There are specific minimum, maximum, and ideal temperatures for every plant. These elements have a big impact on how a plant develops, especially while it’s young.

As a tropical plant, monstera prefers comfortable settings where it can bask in the warmth of the sun’s filtered rays. Large, unappealing black dots appear all over the plant, from its roots to its leaves, when these terms are violated.

Cold Stress

Low temperatures are sometimes disregarded as a problem when caring for your plant. The majority of people are terrified of sunburns and extremely hot temperatures, but cold weather can also be harmful. Monsters can’t really tolerate the cold because of their enormous size.

To warm up, a large plant requires a lot of energy. They can resist temperatures as low as 50 F. (10 C). Anything less WILL cause damage to your plant. The water and sap in the leaves freeze when it snows. This area goes dark because the plant is no longer able to feed it.

Low temperatures can also harm young buds or cuttings used for propagation, turning them black and damaged for the same reasons. Black patches appear on the leaves as a result of the plants’ stopping their growth in this type of environment. Many bacterial and fungal infections can develop at low temperatures as well.

Of course, relocate your plant to a warmer location. I frequently observe folks making the error of merely keeping the plant area warm during the day. If you keep plants in a conservatory (greenhouse) or windowed room, you might occasionally forget to keep the temperature there above 50 F (10 C) at night.

Just because it’s warm during the day doesn’t guarantee that it’ll be pleasant at night. The main goal is to maintain the monster’s bedroom at a comfortable temperature of 64 to 75 F (18 to 24 C)!

Sunburn is a symptom of heat stress

A more common temperature-related problem is sunburn. Although burning your plants is a beginner mistake, you’ll quickly learn how to avoid it. Placing your monstera in the sun, in front of a window, or even under a lamp exposes it to enormous amounts of energy as heat.

You might easily observe black, crispy, and roasted areas on your plant’s leaves and stems. Most of them have an oval or circular shape. Some people prefer to keep their Monsteras outside on a heated patio on sunny days, but this can seriously injure both the leaves and the roots.

Keep your monstera away from windows, particularly those with a southern exposure. It should ideally be put close to a window that faces east. This will provide it a lot of warmth and indirect sunlight throughout the day. Make sure your plant is in the shade and that the ground it will be planted on isn’t too hot if you’re planning to move it outside.

There are issues with humidity

Watering abnormalities typically originate from problems with humidity. Monstera can survive high humidity because it is native to tropical rainforests, but low humidity is never a good thing. Low humidity concentrations and needless misting are the two most common reasons for poor humidity.

Humidity is low

If your plant suddenly starts asking for more water, it might not be a fan of the relative humidity in the space. It is making an effort to consume extra water in an effort to slake the thirst brought on by the water vapor in the air.

Because your monstera prefers a tropical atmosphere to thrive in, maintaining the proper humidity level is essential. Low humidity will cause your plant to wilt and develop black smudges that resemble mold on some of its leaves.

If the soil quickly dries up after watering, raise the air’s humidity. If money is tight, you may always purchase a little plant humidifier. Place wet stones around the pot’s base as a first attempt at resolving the issue. In this way, the water will gradually evaporate into the soil and leaves. Monstera does well in settings where the relative humidity ranges from 50% to 60%.

Misting

For some reason, misting is becoming more and more popular among beginning gardeners. I’m not sure why they employ this technique to increase humidity levels, but I vehemently disagree with it. In the misting technique, water is sprayed onto the plant using a spray bottle.

The problem is that the liquid that emerges from the bottle is not mist. Sorry, but plants don’t like rain, and it is just rain. If you want fungus and insects on your plant, it can lead to water accumulating on the surface of the leaves, but it can also result in dark areas on the leaves.

Your monstera will mist if you spray it with water. It’s that easy! This is your only choice if you reside in a dry environment and lack the funds for a plant humidifier. In such a case, lightly mist—or perhaps I should say spray—the plant several times per day in smaller doses. Follow a misting schedule, which is often every three or four days.

Fertilization is insufficient

Proper fertilizer appears to be a mystery to novice gardeners. Your monstera may have degenerative growth and show black and yellow areas if there is insufficient nitrogen supply. Your plant will be malnourished and more susceptible to disease attacks.

In order to start, use granular fertilizer throughout early development. I favor those with a lot of nitrogen. When the plant promotes leaf development, try using liquid urea, an organic fertilizer with nitrogen as its main component. Apply liquid fertilizer with a nitrogen-to-phosphorus-to-potassium ratio of 20-20-20 during the mature phases.

The rot of the Roots and Stems

One of the causes of these illnesses is overwatering, and the other is fungus. Here’s a quick reminder of the topic of overwatering: too much water is bad. In essence, water clogs absorbent (root) hairs, starving the plant of nutrients and oxygen, as well as inhibiting osmosis.

The effect is that the roots are squishy and dark, and when touched, they scatter. Monstera stems are quickly covered in this gloom. Rhizoctonia solani is one of the fungi that has a comparable effect. They invade the plant’s body using mycelium, blocking xylem channels and depriving it of water and nutrients.

The main difference is that you can actually smell it, whereas overwatering rot exhibits many of the same signs.

Get rid of the undesirable habit of overwatering as soon as you can! Your monstera should not float in the water. Take the plant out of the pot, clean the roots, and use small gardening scissors to trim the unhealthy portions. Always keep all of your equipment tidy. The plant should be repotted in a new container with new soil. I constantly advise creating and adhering to a watering schedule!

Anthracnose

The fungus that causes this terrible disease is Colletotrichum sp. Along the primary vein, it typically leaves behind oval, necrotic leaf tissue. The leaves may curl and fall off on their own if your plant has been exposed to the fungus for a long time. Anthracnose may initially manifest as brown or yellow spots.

This shows that the fungus has penetrated the leaf tissue and is sapping it of all its water and nutrients. The leaf darkens when the water inside it is gone. This fungus only spreads when it is black because it wants to.

The immune system of the plant may also contribute to black patches. The plant blocks the flow of food to the area of the leaf that has anthracnose in order to stop it from spreading.

Remove the entire leaf if the bulk of the leaf’s surface has already been harmed. Use garden shears to create precise cuts. Since these fungi overwinter on dry leaves, it is best to always dispose of them. Another suggestion is to keep your diseased monstera away from healthy plants to stop the spread of the disease.

Black spot on monstera leaf due to waterlogging

When watering Monstera in a pot, use caution. The browning of leaves caused by over watering can quickly make your plant appear twisted and dead. It only need a few short periods of intense rain to complete. Your plant’s roots in moist soil for a few days after it rains can perish during the rainy season since it takes longer for the soil to dry out again.

It requires the optimum ventilation and drainage if you’re growing Monstera in a pot. Because monstera’s thin roots can’t stand extreme humidity, the soil must to be loose and well-drained. But there is a downside: plants that have good drainage need to be watered every day, even after 2-3 days when they first start to wilt. If you want to use less water, you can combine a little more soil.

Dark spots on monstera leave due to lacking light

For monstera to grow, it needs direct sunlight. Tree leaves may wither due to shade. Due to a lack of light, leaves will turn black or brown as they fall off. Until it obtains the proper amount of light, the tree will keep losing leaves.

Avoid overwatering

You should first take your Monstera Delicioa plant out of the pot and clean the unhealthy roots if you have any suspicions that it has been overwatered.

Then, because they are decaying, remove any black roots with a pair of scissors (healthy roots are slightly tan color).

After cleaning the plant pot with soap and water, add fresh soil. To help the soil dry up more quickly and cut down on the amount of times you need to water your plant, add a little amount of gravel or perlite to it.

To help drain the extra water in the pot, add drainage holes to the container holding your plant. On your Monstera Deliciosa, you should also remove any damaged leaves by pruning.