When is it spring in Texas? “You don’t fool the mesquites” is the way the old saying goes when trees start sprouting leaves every year. You don’t fool the butterflies either. This sizeable swallowtail fell in love with some peach blossoms as temperatures edged into the 80s during the past week and things definitely turned springlike. You don’t fool the calendar either. Spring arrived Sunday. Also see page 1B.