Yellowing leaves is a common problem for Aglaonemas, and it is often caused by overwatering. To prevent this, it is important to only water your plant when the topsoil is dry to the touch. During the winter months, it's okay to let your plant dry out a little more between waterings. When you do water your Aglaonema, make sure to provide enough water so that liquid flows out of the drainage hole at the bottom of the pot and into the saucer. Be sure to discard any excess water in the saucer to prevent the roots from rotting due to overwatering.

Insufficient watering and low humidity levels can cause problems for Aglaonema plants. To prevent underwatering, it is important to maintain a consistent watering schedule and only water when the topsoil is dry. If the soil dries out completely, the stems may become limp, and the leaves may droop and become crispy. In such cases, it is necessary to give the plant a thorough watering. Additionally, Aglaonema requires a humid environment to thrive. You can increase the humidity around your plant by misting it regularly, using a pebble tray, or placing a humidifier nearby.

The Chinese evergreen plant is generally resistant to pests and diseases, but it may sometimes develop common houseplant issues such as scale, mealybugs, or spider mites. If you notice these problems, they can be treated with insecticide or neem oil.