Skip to content

Treating Brown Spots on Your Plant: Causes, Solutions and Preventative Measures

Do your beloved houseplants have brown spots on their leaves? Brown spots on houseplants can be caused by a variety of factors, such as cold drafts, too much water, sunburn, underwatering, or lack of drainage. Thankfully, there are ways to treat these pesky spots and get your plant back to its luscious, green self. From pruning to fungicides to adding new soil, read on to learn how to get rid of brown spots on your houseplant leaves!

Causes and Solutions for Brown Spots on Plant Leaves

Brown or black spots on your plant’s leaves can be a cause for concern. While there are a variety of causes, such as cold drafts and too much water, sunburn due to excessive exposure to sunlight, overwatering or lack of drainage, inadequate lighting conditions or underwatering; understanding the reason behind the spots is essential in order to correct the issue. In this article we will discuss some common reasons why your plant may be developing brown spots on its leaves and how you can address them.

One of the most common causes for brown spots on leaves is a potassium deficiency. The most common symptoms of a potassium deficiency are brown or burnt-looking leaf edges and tips, along with chlorosis between leaf veins. If you notice these signs on your plant, it’s important to determine the cause in order to take corrective action and restore the health of your plant.

Another potential cause for brown spots on leaves is too much sun. If your plant is sensitive to sunlight and is receiving too much direct sunlight, it can cause the leaves to burn, resulting in brown spots in the center of the leaves. In this case, you should move your plant to a location that provides indirect or filtered light.

Finally, brown spots on leaves can also be caused by a fungus. This is usually the result of overwatering your plant. The best way to fix this issue is to cut off the affected leaves and let the soil dry out for a few days before watering again. In order to avoid this problem in the future, only water when the top two inches of soil feel dry.

Remedies for Brown Spots on Cannabis Leaves

Manganese Deficiency: Another cause of brown spots on leaves is a manganese deficiency. Symptoms of manganese deficiency in a cannabis plant include yellowing of the leaves at their bases, which then spreads to the tips. If the deficiency is not corrected, brown, necrotic spots will appear all over the leaves and spread throughout the plant. To fix this issue, you can use a fertilizer specifically formulated for cannabis plants that contains chelated manganese or add some Epsom salt directly to your soil.

Removing Leaves with brown spots: It is a good practice to remove any leaves that have brown spots and disinfect the cutting tool between pruning sessions. Infections, pests, and improper care are some of the causes of the splotches. As soon as the leaves have been removed, further investigation is required to identify why the leaves have turned brown and to find the root of the problem.

Dead leaves, dormant stems, and brown parts of leaves should be cut away. When plucking dead leaves or stems with your hands, take care not to pull too hard as this may damage the healthy part of your plant. Pruning shears can be used to remove brown leaf tips.

Unfortunately, once the dead tip cells turn brown, they can’t be revived. However, quick corrections can help restore the rest of the plant to health.

Treating Anthracnose in Hydrangeas

Anthracnose: Anthracnose is a fungal disease that can cause brown, tan, yellowish or black spots on the leaves of hydrangeas. It is most commonly caused by overwatering and poor air circulation. Cankers that form on stems and branches can be used to identify it. In order to fix this issue, pruning out dead or sick plant parts is recommended in order to kill anthracnose in hydrangeas. If the infection has spread too far, fungicide may also be necessary to completely eradicate the disease.

Treatment: The best way to treat leaf spots on hydrangeas is to water at the base of the plant instead of spraying the flowers and leaves. Additionally, any sick flowers or leaves should be trimmed immediately in order to prevent further spread. If necessary, a copper-based fungicide can be used to completely eradicate the disease. Other treatments such as liquid kelp, hydrogen peroxide or garlic oil may also prove useful.

During the summer months, water these shrubs deeply every few days (note that hand watering is not sufficient) and mulch around them to keep the soil moist.

The most effective fungicides for hydrangeas are chlorothalonil and thiophantate-methyl. Be sure to read the label of each bottle and use as directed, typically every 10 to 14 days.

Treating Common Rose Diseases and Overwatering

Black Spot: Black spot is a common fungal disease of roses that can cause yellowing and brown spots on leaves. It is most prevalent during wet weather and spreads quickly from plant to plant. It is important to act quickly when you see the first signs of black spot, as it can spread throughout your garden if not treated promptly. Luckily, black spot can be prevented and its damage minimized if active treatment with Daconil® fungicide is initiated at the first sign of disease. Treat every seven to 14 days or as long as weather conditions warrant, and mark your garden journal to remember to start preventative treatments early next year. Additionally, you should always remove any affected leaves from the ground or nearby plants in order to avoid further spread of the disease.

Overwatering: If your rose bush is overwatered, the leaves will turn yellow and droop. Don’t overwater your rose plant because it can cause root rot and cause the plant to die. To prevent root rot, check soil moisture levels by sticking your finger into the soil up to two inches deep. If it feels dry, then water thoroughly but if it feels moist, wait until the next day before watering again. Additionally, make sure that there is proper drainage in order for excess water to flow away from the roots of your plants.

Preventing and Treating Brown Spots on Tomato Plants

Fungicides: One of the most effective methods to get rid of brown spots on tomato plants is to use fungicides. The most commonly used fungicide for tomato spots/blight is chlorothalonil, which is available in a variety of brands. This chemical helps to control leaf spot and blight, but it must be applied correctly and at regular intervals in order to be effective. Additionally, an organic fungicide such as Serenade can also be used as an alternative treatment option if desired. When using either type of fungicide, make sure that you follow the directions on the label carefully in order to ensure proper application and safety when handling the product.

Septoria Leaf Spot: Septoria leaf spot is a fungal disease caused by the fungus Septoria lycopersici. This disease affects tomatoes and other plants in the Solanaceae family, such as potatoes and eggplants, all over the world. Symptoms of this disease include small brown spots on tomato leaves with yellow halos around them. If left untreated, these spots can spread to other parts of the plant and cause it to become stunted or even die. In order to prevent this from happening, it is important to take action right away when you first notice any signs of leaf spot on your tomato plants.

Caring for a Monstera Deliciosa to Prevent Brown Spots

Another common cause of brown spots on leaves is low humidity. Monstera deliciosa in particular, take in more water through their leaves than other plants, meaning they are more sensitive to changes in the air around them. If there isn’t enough water in the air and your Monstera leaf is exposed to this dryness for too long, it can cause the edges or tips of its leaves to turn brown. To prevent this issue from happening, you should make sure that your plant has adequate humidity levels at all times. This can be achieved by misting regularly or setting up a humidifier nearby. Additionally, you could also place a tray of wet pebbles beneath your plant’s pot so that it will absorb moisture from the stones and help maintain an optimal level of humidity around it.

Another important part of caring for a Monstera deliciosa is pruning. Pruning involves removing any dead or dying leaves from the plant, as well as encouraging new growth and controlling where it produces new leaves (or branches in the case of some plants). This will help to keep your Monstera looking healthy and vibrant, and can also help to prevent any further brown spots from appearing.

Finally, if your Monstera is showing signs of black spots, it could be a sign of root rot. In order to fix this issue, you should first put fresh, new soil in the pot by washing it out with soap and water. To increase drainage and help remove excess water from the pot, add a few handfuls of perlite or gravel. Additionally, make sure that your plant’s pot has drainage holes so that any excess water can escape easily. Once you’ve done this, carefully remove the leaves from the Monstera and plant in the new soil.


Overall, brown or black spots appearing on Monstera and other plants can be caused by a variety of factors. It is important to take these into consideration when trying to diagnose and treat any issues. Proper care and maintenance are key to ensure a happy and healthy plant. Regular pruning can help keep the plant healthy and prevent issues from developing. Lastly, make sure that when you water the plant, it is done at the base, not the leaves, and not too frequently.