From our experience here at 247Garden, it is almost impossible to overwater plants in grow bags with good soil drainage. Overwatering or drowning a plant can occur when the soil in the pot becomes saturated with water, which can deprive the plant's roots of oxygen and cause them to rot. It can also lead to other problems, such as the development of fungal diseases. To prevent overwatering, it is important to monitor the moisture level of the soil in the pot and water only when the soil is dry to the touch. You can use a moisture meter or your finger to check the moisture level. In addition, it is a good idea to allow the soil to drain well after watering and to avoid overfilling the grow bag with hard to drain soil, which can cause excess water to pool at the bottom.