Most romaine is grown in the Salinas Valley in California, during a long growing season where product is ready from April to November [1]. In the winter months

Most romaine is grown in the Salinas Valley in California, during a long growing season where product is ready from April to November [1]. In the winter months [2], coastal areas get too wet and the Sonora Desert becomes ideal. Production shifts to areas like Yuma, El Centro and the Imperial Valley, the Coachella Valley, and Blythe. [1] https://apps1.cdfa.ca.gov/FertilizerResearch/docs/Lettuce_Production_CA.pdf https://apps1.cdfa.ca.gov/FertilizerResearch/docs/Lettuce_Pr... [2] https://anrcatalog.ucanr.edu/pdf/7216.pdf https://anrcatalog.ucanr.edu/pdf/7216.pdf