Paine, T.D., C.C. Hanlon, D.R. Pittenger, D.M. Ferrin and M.K. Malinoski
Consequences of water and nitrogen management on growth and aesthetic quality of drought-tolerant woody landscape plants
J. Environ. Hort. 10(2): 94-99
Two drought-tolerant California native plant species (a nonselected from of Ceanothus griseus var. horizontalis, C. griseus var. horizontalis 'Santa Ana', a nonselected form of Rhamnus californica, and R. californica 'Eve Case') and a widely planted non-native landscape species (Photinia fraseri) received the same total volume of water (63.8% ET0) over a 14 week period in one of four irrigation treatments (water applied daily, every three days, every five days, or every seven days). Each irrigation treatment also received one of three rates of nitrogen application (0, 20 g N/m2 [0, 180, and 360 lb. N/A]). The irrigation frequencies or fertilization rates had few significant effects on plant growth and survival. Selection of a cultivar of R. californica has resulted in increased growth rates and aesthetic quality, but has also increased susceptibility to root pathogenic fungi.