 He also wrote on historical topics, such as the roots of the state's agriculture in the Spanish mission system, and he wrote various bulletins for the U.S. Department of Agriculture.Wickson was an advocate for the experimental horticulturist Luther Burbank and wrote about him in "Luther Burbank; Man, Methods and Achievements", published in book form in 1902.They had both come to California in 1875, and they knew of each other very soon thereafter.