Speaker: Lorence Oki, Ph.D., Specialist in Cooperative Extension, University of California, Davis

The University of California Landscape Plants Irrigation Trials project evaluates performance of plants exposed to three different irrigation treatments based on evapotranspiration (ETo). The data collected leads to recommendations for irrigating those plants that are used by landscape designers and architects to design landscapes that comply with California water conservation regulations. This project started in 2004 as a graduate student research project, was expanded periodically, and then duplicated at the UC South Coast Research and Extension Center in 2017. The project recently has expanded to the University of Washington, Oregon State University, Utah State University, and the University of Arizona that facilitates the comparison of plant performance in response to deficit irrigation treatments across the western region of the U.S. We will discuss plant lists, data collected, irrigation recommendations, and project background.