Do you remember when dried plums were called prunes? All prunes are plums, but not all plums are prunes. Prune plum varieties have very high sugar contents that enable them to be dried without fermenting, while still containing the pits.
Research conducted in the US showed that the target audience, women ages 25 to 54, responded more favorably to the name dried plums. It is also more descriptive for people who didn’t know that prunes are plums that have been dried. Outside the US, it is still called a prune. Regular people know the value of prunes.