Updated: May 18, 2022

Cast iron plants are known for their resilience and hardiness, but they are not immune to fungal infections. If you notice signs of fungal growth on your cast iron plant, it’s essential to take action immediately. Here are some tips on how to get rid of fungus on your cast iron plant.

Identify the Fungus

The first step in getting rid of fungus is to identify the type of fungus that’s growing on your plant. Different types of fungi require different treatments, so it’s essential to know what you’re dealing with. Some common types of fungi that affect cast iron plants are powdery mildew, black spot, and rust.

Powdery mildew appears as a white or grayish powder on the leaves and stems of the plant. Black spot appears as black spots on the leaves, while rust appears as orange or brown spots on the leaves.

Remove Infected Leaves

Once you’ve identified the fungus, it’s time to remove infected leaves. Use a pair of sterilized pruning shears to cut off any leaves that show signs of infection. Be sure to dispose of the infected leaves in a sealed plastic bag to prevent the spread of fungus.

Improve Air Circulation

Fungi thrive in moist environments, so improving air circulation around your cast iron plant can help prevent the spread of fungus. You can do this by placing a fan near the plant or by moving it to a location with better air circulation.

Use Fungicides

If the fungal infection has spread beyond a few leaves, you may need to use a fungicide to get rid of it completely. There are many different types of fungicides available, so be sure to choose one that’s safe for use on cast iron plants.

Follow the instructions carefully when applying fungicide and be sure to wear protective clothing, such as gloves and a mask.

Keep the Plant Healthy

Finally, it’s essential to keep your cast iron plant healthy to prevent future fungal infections. Ensure that the plant is getting enough sunlight, water, and nutrients. Avoid overwatering the plant as this can create a moist environment that’s perfect for fungal growth.


Fungal infections can be a major problem for cast iron plants, but with the right treatment, you can get rid of them quickly and easily. By identifying the fungus, removing infected leaves, improving air circulation, using fungicides, and keeping the plant healthy, you can ensure that your cast iron plant stays healthy and fungus-free.


Can I prevent fungal infections on my cast iron plant?

Yes, you can prevent fungal infections by ensuring that your plant is getting enough sunlight, water, and nutrients. Avoid overwatering the plant and improve air circulation around it.

How often should I apply fungicide to my cast iron plant?

Follow the instructions on the fungicide carefully. Some fungicides need to be applied every week, while others may only need to be applied once or twice a month.

Can I use natural remedies to get rid of fungal infections on my cast iron plant?

Yes, there are several natural remedies you can use to get rid of fungal infections on your cast iron plant. These include neem oil, baking soda solution, and apple cider vinegar solution.