Comment by lekanwang

The unfortunate thing is that large stretches of California desert (and much of the Central Valley to the north) used to be lake bottoms and have incredibly rich and fertile soils. Between that and a long growing season that's nearly cloudless, you get ideal growing conditions -- rich soil, lots of sun, low moisture (i.e. low disease load), and H2A labor -- provided you can control the irrigation. Ah the problems caused by mispriced externalities...