In 1857, the Whitneys' arrival in Rocklin signaled the start of the Spring Valley Ranch. In the early 1900s, another important chapter of Rocklin's agricultural history began with the arrival of Japanese and Spanish immigrants. Both groups were attracted to Rocklin's Mediterranean climate. On the ridge in the eastern section of Rocklin were the ranches of the Uyeda, Sasaki, Hori, Corral, Aguilar, and Alva families. Key crops of the time included oranges, raisins, plums, and other fruit trees. Berries and watermelons were also planted, providing the ranches with additional income. Today, the orchards have been replaced by residential developments.