Why does my Aglaonema have brown leaves? 

Aglaonema plants can develop brown leaves for several reasons, including overwatering, underwatering, pest infestations, or disease. Here's a detailed guide on why your Aglaonema plant has brown leaves and how to solve it:

1. Overwatering Overwatering is one of the most common reasons why Aglaonema plants develop brown leaves. When the soil is constantly wet, it can lead to root rot, which can cause the leaves to turn brown and eventually fall off. To solve this issue, you should water your plant less frequently, allow the soil to dry out partially between watering, and ensure that the pot has adequate drainage.

2. Underwatering Underwatering is another common reason why Aglaonema plants develop brown leaves. When the plant doesn't get enough water, the leaves will start to dry out and turn brown. To solve this issue, you should water your plant more frequently, ensuring that the soil is moist but not waterlogged.

3. Pest infestations Pest infestations can also cause Aglaonema plants to develop brown leaves. Spider mites, mealybugs, and scale insects are common pests that can feed on the plant's leaves, causing them to turn brown and fall off. To solve this issue, you can use an insecticidal soap or oil to treat the plant or manually remove the pests with a cotton swab dipped in rubbing alcohol.

4. Disease Diseases like bacterial or fungal infections can cause Aglaonema plants to develop brown leaves. To solve this issue, you should remove the affected leaves and treat the plant with a fungicide or bactericide.

5. Environmental stress Aglaonema plants can develop brown leaves in response to environmental stressors like extreme temperatures, drafts, or changes in light levels. To solve this issue, you should ensure that the plant is in an appropriate location with consistent temperature and lighting conditions.

In summary, Aglaonema plants can develop brown leaves due to overwatering, underwatering, pest infestations, disease, or environmental stress. To solve this issue, you should identify the underlying cause and take appropriate measures to rectify it. By providing your Aglaonema plant with the right conditions, you can prevent brown leaves and keep it healthy and beautiful.