Many municipalities now require a certain percentage of native trees and shrubs in new landscape installations. Introduced woody species are increasingly perceived as undesirable, primarily because they are lumped together with their invasive counterparts. This presentation will summarize the current science regarding the effects of native and nonnative tree species on urban landscape stability. A more practical approach than simply mandating more native species will be suggested.
Dr. Linda Chalker-Scott has a Ph.D. in horticulture from Oregon State University and is an ASCA member and an ISA certified arborist. She is WSU’s extension urban horticulturist and an associate professor in the Department of Horticulture and also holds two affiliate associate professor positions at University of Washington. Dr. Chalker-Scott is an award-winning author of four books providing science-based information for arborists, landscape professionals, and home gardeners. She also publishes extensively in the scientific and popular journals. She is one of the Garden Professors—a group of academic colleagues who educate and entertain through their blogs and Facebook pages.