How to Fix Brown Spots on Pothos Leaves Before They Spread

Pothos seems to be a perfect plant. It tolerates low light and irregular watering with ease. However, it’s still vulnerable to factors like overwatering, infections, and direct sunlight. Pothos brown spots often indicate these specific issues. 

Still, they are symptoms, and to get rid of them, you need to identify the cause correctly. You can do it in seconds with the Botan disease identifier, but knowing the patterns and right approaches is also helpful. 

So, if you want to understand your pothos better, just keep reading. We share all the most important information below.

Why Brown Spots Appear on Pothos Leaves

Black or brown spots on pothos leaves always indicate serious stress, damage, or disease. They may look quite similar even when the causes are different, which is why it’s crucial to spot all the details. 

For example, you can notice: 

• Dry and crisp spots — often surface-level, appearing on the sun-exposed side or newer growth. 
• Wet, soft, expanding spots — the most common type, often move up from roots, tissue collapses when touched. 
• Spots with a border — a yellow halo or a distinct darker border. 
• Irregular necrotic patches — shapeless, with no defined margins. 

Generally speaking, dry spots indicate temperature damage. Wet spots are often caused by bacterial damage. Necrotic spots or spots with borders often indicate fungal infection. 

But this is just a general principle. A more advanced, step-by-step approach is required to correctly identify the cause. 

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How to Identify the Cause Before Treating the Plant

If you want to examine golden pothos brown spots, whether wet, dry, with or without borders, take the following steps: 

1. Take a look at the roots. Pull the pot up or unpot the plant. See if roots are light (normal) or dark and mushy. In the second case, this might be a root rot. 
2. Check if the soil has been wet for a long time. Also, check if it has a sour odor. If yes, this might be an infection. 
3. Examine the stem. See if there are any lesions, discoloration, or soft spots. If yes, it can be fungal. 
4. Check the location of spots. Root rot usually appears on the older leaves. Infections and environmental damage may target upper leaves. 
5. Consider care changes. If you started watering more, it may indicate root rot or infection, and rule out temperature damage. 

That’s how you narrow the search, but further detailed analysis is still required.  

Alternatively, you can use a tool like Botan, which is more than just a flower identifier. If you take a photo of a damaged pothos, the system will analyze the symptoms listed above and provide a specific diagnosis and treatment plan. 

Common Causes of Brown Spots on Pothos Leaves

Let’s dive deeper into the three most common reasons for the appearance of dark spots: overwatering, infections, and sunlight or heat stress. 

Overwatering and Root Stress

If you grow your plant in a pot, it can be damaged by excessive moisture, or rather, the resulting lack of oxygen that roots also depend on. So, when overwatered, roots can’t breathe, start rotting, and turn brown and then black. 

You can see it in the leaves, too. They turn yellow and develop quite large brown spots that then turn black. 

Fungal or Bacterial Leaf Problems

High humidity, poor air circulation, and wet foliage can also trigger fungal or bacterial infections. Unlike overwatering, they do not always affect roots. Unlike spots from environmental stress, they spread.

The most common fungal infections include Rhizoctonia and fungal leaf spot, triggered by different pathogens. In all cases, spots are dark-brown or black, with defined edges and visible structure. Frequently, fungal spots also have a yellow halo, a darker border, and even visible spores at the center. 

Bacterial leaf spot and bacterial wilt also cause spots that are typically water-soaked and angular or V-shaped.

Direct Sunlight or Heat Stress

Pothos plants need bright, but indirect sunlight 6-8 hours a day. However, they can get sunburns from direct sun, and that’s exactly the case when black spots may appear. 

Often, you can notice such damage in plants that are closest to a window. Plants with light-colored leaves are also very vulnerable.

You can easily distinguish them from fungal spots or spots from overwatering. They are firm and crisp, and they don’t spread. 

Brown Spots on Pothos: Cause, Signs, and First Fix

Now, let’s sum it up in a quick guide to cause identification. 

* Note that a few things can cause brown spots on pothos simultaneously. That’s frequently seen with root rot and fungal infection. 

Step-by-Step Pothos Leaf Rescue Plan

If you want to do everything correctly, use this simple checklist: 

1. Inspect the spots first. Identify the most likely reason. Consider the location, moisture level, and spreading patterns. 
2. Remove damaged leaves. It’s not necessary in the case of temperature damage. If you suspect a fungal or bacterial infection, it’s a must. Use sterilized tools. 
3. Check and help the roots. Cut off all dark and rotten parts. Dry wet roots for a few hours. 
4. Isolate the plant. It’s necessary if you suspect a bacterial infection.
5. Stop misting. Also, if the fungal infection doesn't improve, apply a fungicide.

After you do that, monitor the situation for the next few weeks. If there’s no improvement, the diagnosis might be incorrect, or the plant is too damaged to recover (for example, due to a severe bacterial infection).

How to Prevent Brown Spots from Coming Back

To prevent similar problems in the future, remember the key rules of pothos care: 

1. Water only when the top 2 inches of the soil are dry (approximately every 1-2 weeks, but don’t rely on the schedule). 
2. Move your pothos from direct sunlight. 
3. Ensure temperatures above 55°F / 13°C. 
4. Use a pot with drainage holes. 
5. Check for pests every 2-3 weeks. 

Also, use fertilizer not more often than every 4-6 weeks during the active growth.