Landscape plant irrigation trials©
With its large population and Mediterranean climate, CaliforniaRSQUOs water supply is a valuable, but limited, resource that has been made even more apparent during the current multi-year drought. About half of the water consumed in residences is provided as irrigation to landscapes. In the past, plants used in landscapes were chosen only for their ornamental value, but recently more consideration is also given to their water needs. To contribute to information on plant water use, an ongoing study at the University of California, Davis developed irrigation requirements. Plants were installed in a field in the fall of the year and provided ample amounts of water during the first summer. During the second summer, from April to October, four irrigation treatments at 20, 40, 60 and 80% of reference evapotranspiration (ET0) (CIMIS) were provided to the plants. Evaluations of plant size, appearance, and other quality parameters were measured each month. Recommended irrigation rates were developed from the evaluations and reported to funding sources and posted online.
Oki, L.R., Reid, K. and Sisneroz, J. 2016. Landscape plant irrigation trials©. Acta Hort. (ISHS) 1140:145-150