A controlled, randomized trial of 12 low-income New York elementary schools indicates that school gardens can positively contribute to increased physical activity in children. Children at schools that received a school garden demonstrated a decrease in sedentary activity and an increase in moderate physical activity as compared to their peers who did not receive a garden.
Nancy M. Wells, Beth M. Myers, and Charles R. Henderson Jr. “School gardens and physical activity: A randomized controlled trial of low-income elementary schools.” Preventative Medicine 69 (December 2014): S27-S33.