C. D. Gustafson states: "San Diego’s focus on avocado crops started in the 1920s. By 1936 San Diego County was growing avocados approximately 7,900 acres and by 1957 that grew to 15,000. Although Fallbrook is known for its avocado groves and claims, without any official recognition, the title "Avocado Capital of the World,” the green fruit thrived in many areas of the county, including Carlsbad, Oceanside, Leucadia, Encinitas, Solana Beach, Spring Valley, La Mesa, El Cajon, Winter Gardens, and some parts of Lakeside. Fallbrook, Escondido, Vista, and the Rincon Springs - Pauma Valley." Now that you're an expert on basic avocado history, here's how to celebrate the national holiday in San Diego.