Brown leaves on your fern could be a sign that your plant is unhappy in its current environment, or there’s an underlying problem such as under or overwatering that can be solved by making a few changes to your plant care routine. Most of the reasons for leaves turning brown are nothing to worry about and can be easily solved. 

Identifying the cause is essential to solve the issue and prevent it from recurring, all while keeping your fern as happy and healthy as possible. 

Here are some of the most common reasons for brown leaves on ferns and how you can address them.

1. Underwatering or inconsistent watering 

Ferns require constant moisture in the soil so if the soil dries out, the plants leaves can often turn brown and crispy. 

All you need to do is make sure you keep the soil evenly moist, but not soggy. Check the soil frequently and only water when the top one to two inches feel dry to the touch. Many plant owners like to water their plants on a schedule but testing the soil with your finger every couple of days is the best way to tell whether your plant needs watering or not.

2. Overwatering

Watering plants is a fine balance. Overwatering can cause root rot in your plant, which can lead to brown leaves. Check the soil - if it’s soggy and the plant’s roots are mushy, you may be overwatering your fern. 

To solve this problem, reduce your watering frequency and ensure that the soil is well drained. If root rot has become more advanced, you might need to trim away the affected roots and repot your fern in fresh soil. 

For more information on watering your houseplants, have a look at our guide: How often should you water your houseplants? 

3. Low humidity 

Ferns love a humid environment. If the air in the room is too dry, your plant’s leaves might turn brown, especially at the tips. 

Try increasing the humidity around your fern by placing a tray of water near your plant, misting the leaves regularly, or using a humidifier. 

4. Nutrient deficiency 

A lack of essential nutrients in the soil can cause browning leaves. Try adding a balanced, water-soluble fertiliser at half strength every 4-6 weeks during the growing season to give your plant the nutrients it needs. 

If you want to know how to choose the best food for your houseplants, check out our blog: How to choose a houseplant food. 

5. Sunburn 

Ferns prefer indirect or filtered light. Direct sunlight can cause the leaves to turn brown and crispy so if you see this happening, move your fern to a different location with bright, indirect light to avoid this problem. 

Want more info on where your houseplants should go in your home? Read our blog: Best places in your home for houseplants. 

6. Pest infestation 

Pests such as spider mites, aphids or mealybugs can cause browning leaves. Make sure you inspect your fern regularly for signs of pests and treat any infestations promptly using insecticidal soap or neem oil.

For more information on houseplant bugs, take a look at our guide: Houseplant bugs: uninvited guests in your oasis. 

7. Disease

Fungal diseases in your plants can cause browning leaves. To prevent this problem, always ensure good air circulation around your fern, avoid overhead watering and remove any affected leaves. If a fungal infection appears to be more severe, apply a fungicide according to the label instructions. 

If you want to solve the issue of brown leaves on your fern, we always recommend identifying the underlying cause and address it accordingly. By maintaining proper care, including appropriate watering, humidity, lighting, and pest control, you can help to keep your fern healthy and prevent future browning.