Certified Professional Horticulturist (CPH) Practice Exam

Why should indoor plants be potted in containers with holes at the bottom?

1. To permit excess water drain

2. To allow water absorption by the roots on an as needed basis

3. To allow aeration of the soil from both the bottom and the top

4. To facilitate removal of the plant from the container when a plant eventually requires replanting

The correct answer is: To permit excess water drain

Pots with holes at the bottom are crucial for indoor plants because they allow excess water to drain out. When plants are watered, some water will saturate the soil, and if the pot does not have drainage holes, this water can accumulate at the bottom, leading to waterlogged soil. Overly wet soil can create a host of problems, including root rot, which occurs when roots sit in stagnant water and begin to decay. Adequate drainage ensures that the water can exit the container, preventing these issues and promoting healthier root development. This capability is fundamental in maintaining proper moisture levels within the soil, allowing for a well-balanced environment that supports plant health.