Anthurium plants can develop brown leaves due to various reasons, including environmental stress, watering issues, pests, and diseases. Here's a detailed guide on why your Anthurium plant may have brown leaves and how to solve it:

1. Environmental Stress Anthurium plants are sensitive to changes in temperature and humidity. Exposure to direct sunlight, extreme temperatures, or dry air can cause the leaves to turn brown. Move the plant to a more suitable location, such as a shaded area with moderate temperatures and humidity levels.

2. Watering Issues Overwatering or underwatering can cause the leaves of Anthurium plants to turn brown. Overwatering can lead to root rot, which can cause the leaves to turn brown and wilt. Underwatering can cause the leaves to dry out and turn brown. Ensure that the soil is evenly moist but not waterlogged and avoid letting the plant sit in standing water.

3. Pests Pests such as spider mites, mealybugs, and scale insects can cause damage to Anthurium plants, including brown leaves. Inspect the plant for signs of pests, such as webbing, sticky residue, or small insects, and treat the plant with an appropriate insecticide.

4. Diseases Fungal diseases such as leaf spot or root rot can cause the leaves of Anthurium plants to turn brown. Symptoms of leaf spot include small brown spots on the leaves, while root rot can cause the entire plant to wilt and turn brown. Ensure that the plant has proper drainage, and avoid getting the leaves wet when watering.

5. Nutrient Deficiency A lack of essential nutrients such as nitrogen or potassium can cause the leaves of Anthurium plants to turn brown. Fertilize the plant with a balanced fertilizer, or one that's specific to the nutrient deficiency.

In summary, brown leaves on Anthurium plants can be caused by environmental stress, watering issues, pests, diseases, or nutrient deficiency. By identifying the cause of brown leaves and taking appropriate action, you can ensure that your Anthurium plant stays healthy and vibrant.