Landscaping License Practice Test

Which of the following is a common sign of over-watering plants?

1. Leaves turn yellow and drop

2. New growth emerges

3. Stems grow taller

4. Flowers bloom more profusely

The correct answer is: Leaves turn yellow and drop

The sign of over-watering plants is illustrated by the leaves turning yellow and dropping. This occurs because excess water saturates the soil, leading to poor oxygen levels in the root zone. As a result, the roots can suffer from a lack of oxygen, which translates into stress for the plant. When this stress happens, chlorophyll production diminishes, causing the leaves to lose their vibrant green color and turn yellow. Ultimately, the plant may shed these yellow leaves in an attempt to conserve resources and to cope better with the conditions of over-saturation. In contrast, new growth, taller stems, or more profuse blooming typically indicate healthy plants receiving adequate water and nutrients. These signs imply that the plants are thriving, whereas yellowing and dropping leaves are a strong indication of water-related stress, leading to a decline in overall plant health.