Texas FFA Nursery Landscape Practice Exam

If a container-grown nursery crop has been overwatered for an extended period, what might be observed regarding the roots?

1. The roots are growing through the drain holes in the bottom of the container

2. The roots are dead or absent at the top but healthier at the bottom

3. The roots may be extra thick and bright white in color

4. The roots are dead or absent at the bottom but healthier at the top

The correct answer is: The roots are dead or absent at the bottom but healthier at the top

When a container-grown nursery crop is overwatered for an extended period, one of the consequences is the potential for root rot and other detrimental effects due to excessive moisture. In this scenario, the bottom of the container often becomes waterlogged, leading to a lack of oxygen in the root zone. Roots require oxygen to survive, and when they are submerged in too much water, they can suffocate, leading to their decline or death. As the waterlogged conditions persist, the roots located at the bottom of the container are most severely affected due to consistent exposure to excess water. These roots may become dead or absent entirely because they cannot survive without sufficient oxygen. In contrast, roots that are situated higher up in the container may still be able to access the oxygen-rich air near the surface, allowing them to remain healthier and more functional. Typically, these healthier roots at the top can appear more vibrant and are better able to take up water and nutrients, thus exhibiting signs of life while those at the bottom struggle or die off completely. This pattern of root health provides a clear indicator of overwatering and will help in diagnosing and managing watering practices for container plants.