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The flowers, which are open only a day, are used in salads. Young leaves can be added to salads or chopped and used in stir fries. Note the leaves are not sweet. A close relative Hibiscus sabdariffa (the true Roselle) is also called the Cranberry Hibiscus. It's fat calyces are used from Florida to South America to make a tart cranberry-like flavored drink.