Why is my African Milk Tree cactus turning brown?

Seeing your African Milk Tree (Euphorbia trigona) turning brown can be concerning, but it's important to understand the underlying causes to help your plant recover. Here are some common reasons why your cactus might be showing signs of browning and tips on how to address them:

1. Overwatering

One of the most common reasons for browning in cacti is overwatering. African Milk Trees prefer well-draining soil and should be watered only when the top inch of soil is dry. Excess moisture can lead to root rot, causing the plant to turn brown and soften. Ensure your pot has drainage holes and allow water to fully drain out after watering.

2. Underwatering

On the other hand, underwatering can also cause browning. If the plant is too dry, it will start to shrivel and you may notice brown spots. Make sure to establish a consistent watering schedule that ensures the plant gets enough moisture without becoming waterlogged.

3. Sunburn

Another potential reason for browning could be too much direct sunlight. While African Milk Trees like bright light, intense direct sunlight can scorch their surface. If the browning is occurring on the side facing the sun, consider relocating your cactus to a spot with indirect sunlight or filtered light. Check our African Milk Tree guide on sunlight.

4. Pests & Diseases

Inspect your plant for any pests (like mealybugs or spider mites) or diseases that could be causing the browning. If you find any pests, treat them promptly with insecticidal soap or neem oil. For diseases, it’s best to remove affected areas and ensure proper air circulation around the plant.

5. Nutrient Deficiency

Sometimes, browning can be a sign of nutrient deficiency, particularly if the plant has not been fertilized in a while. Using a diluted cactus fertilizer during the growing season can help boost nutrient availability.

Final Thoughts

Identifying the precise cause of browning is key to helping your African Milk Tree thrive. By adjusting your watering habits, ensuring proper light conditions, and keeping an eye out for pests, you can help your cactus return to its healthy, vibrant self! Check out our full milk tree care guide for tips on keeping it healthy.