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The reason you're seeing blueberries year-round in stores is due to a huge improvement in naturally hybridizing commercial blueberries to remove this requirement for frost and chill hours. The industry owes a big debt mainly to U of Florida's Dr. Lyrene for discovering blueberries that could fruit without the need for a winter. https://floridaaghalloffame.org/2011/11/dr-paul-lyrene/ You'll have good luck with any of his varieties in California.