What is a key sign of over-watering in nursery plants?

Yellowing leaves and root rot is indeed a key sign of over-watering in nursery plants. When plants receive too much water, the roots can become saturated and may not get enough oxygen, leading to root rot. As the roots deteriorate, they are unable to take up water effectively, which can cause the leaves to yellow. This yellowing is often accompanied by a general decline in plant health as the roots struggle to function properly. In severe cases, over-watering can result in the plant's death due to a lack of healthy roots.

The presence of yellow leaves can indicate nutrient deficiencies caused by poor root health, further underscoring the critical nature of proper watering. Recognizing these signs early can help in managing watering practices to promote healthier plants.