From the Spanish colonial days up until WW2, the area now known as Silicon Valley was mostly fruit orchards. Due to the warm, mild climate it's the perfect place for growing citrus fruits, strawberries, etc. Back then it was known as the "Valley of Heart's Delight".
Here and there you'll still see an orange or lemon tree peeking up from behind a fence on someone's property, a reminder of what the land used to be. Sometimes I think growing delicious, nutritious fresh fruit is a much more morally justifiable use for the land than what it's used for now -- mostly gigantic mansions for overpaid software engineers and managers. The fruit growers have all had to move further south to the Gilroy area or further east to the Central Valley.
Pictured above is the orange tree in the backyard of the house Sushu's family had built in Palo Alto. The oranges are slightly less sweet/ more sour than the ones you get from the grocery store, but still good. And free!
And yes, the picture above is from this week. They ripen in December. (I've been here almost 3 years now and I still can't get used to this whole no-winter thing.)