Which horticultural practice enhances air circulation around plants?

Pruning enhances air circulation around plants by selectively removing certain branches and foliage. This practice opens up the plant structure, allowing air to flow more freely through the canopy. Improved air circulation helps reduce humidity around the plant, which can decrease the likelihood of diseases such as mold and mildew that thrive in damp conditions. Additionally, better airflow can improve photosynthesis and overall plant vigor as light penetrates deeper into the plant structure.

The other practices listed do not focus on air circulation. Watering, while essential for plant health, does not improve airflow. Fertilizing provides nutrients but does not influence circulation. Mulching can help retain moisture and regulate soil temperature, but too much mulch around a plant can actually hinder air movement. Therefore, the significance of pruning lies in its direct impact on enhancing air circulation, promoting healthier plant growth.