Certified Arborist Practice Exam

During which times of the day are most beneficial to water plants?

1. Noon and midnight

2. Early morning and late evening

3. Afternoon and dawn

4. Dusk and dawn

The correct answer is: Early morning and late evening

Watering plants during early morning and late evening is the most beneficial because during these times, there is less evaporation due to lower temperatures and reduced wind. This allows the plants to absorb more water effectively before the heat of the day kicks in. Watering at noon and midnight can lead to water loss through evaporation under the hot sun or potential water stagnation during the night, which can be detrimental to the plants. Watering in the afternoon might not be as effective as during the early morning because the water may evaporate quickly in the heat. Similarly, watering at dusk and dawn may not be as beneficial as during the early morning and late evening due to the potential for faster evaporation rates in the morning and the cooler temperatures in the evening.