Citrus is one of the crops that "made" California. In the late 1800s, Riverside County California was the seat of California's citrus industry, and the wealthiest county in the country. We go back in time to discover the beginnings of the industry, then fast forward to Citrus today. We see how new citrus genetics entering the country are evaluated and treated by the USDA before being conserved for the future, and shared with breeders. We visit a " living citrus museum" at the University of California Riverside, where there are 1,000 kinds of citrus, both historic and modern. After a sneak preview of upcoming varieties, we head to a commercial grove in Pauma Valley to meet the third and fourth generations of a successful family citrus orchard. In northern California, we visit a nursery that offers the widest selection of citrus varieties for commercial and home growers. There, we learn how to plant and grow citrus in our backyards.