Jared Farmer’s new book, “Trees in Paradise: A California History” (Norton, 2013), explores California’s first hundred years as a state through four trees: redwoods, eucalyptus, citrus, and palms. During this time, horticulturists planted innumerable trees, importing ornamental and commercial species to create moneymaking orchards and tree-lined boulevards. In this lecture, he describes the impact of this era on Southern California. Farmer is an associate professor of history at Stony Brook University.