Linda Chalker-Scott has a Ph.D. in Horticulture from Oregon State University and is an ISA certified arborist. She is Washington State University s Extension urban horticulturist and an associate professor in the Department of Horticulture and maintains affiliate associate professor status at University of Washington. She develops educational materials for home gardeners, certified arborists, restoration ecologists, pesticide applicators, and the nursery and landscape industry. At WSU, she is co-chair of the Garden Team, an interdisciplinary group that produces science-based Extension publicat...