A common fallacy expounded by midwesterners who move to California. When confronted by the seemingly mild climate and the bountiful produce, they are transported to use all sorts of hyperbole in describing their newfound paradise.
In California the seasons are subtle, and quick to change. And there actually are agricultural seasons, and we get imported produce, like everyone else, from Mexico and Chile, when the growing season is not right for romaine, basil, tomatoes or radicchio.