Girls and greenery
According to the University of Illinois Champaign's Human-Environment Research Laboratory, "A study by University of Illinois researchers Andrea Faber Taylor, Frances E. Kuo and William C. Sullivan has found that the greener and more natural a girl's view from home, the better she scores on tests of self-discipline. The greater a girl's self-discipline, the more likely she is to do well in school, to avoid unhealthy or risky behaviors and to behave in ways that foster life success.
Boys showed no link between test scores and nature near home, but for girls, on average, the greener the view the higher the scores. Maintaining trees and greenery at home may help support in girls the self-discipline they need to succeed.
More complete research results are available at http://www.herl.uiuc.edu/girls.htm.