Cranberry is a very popular fruit(?) in Russia. Apart from it being a stockroom of vitamins, it's also one of very few berries that can be stored for long. So in wintertime, when everything else is eaten out, cranberries used to be the last fruit available bebore new harvest.
And I value them for being extremely useful for one's health: if you catch a cold, just make a drink of cranberries, sugar and warm water and have it every hour. You'll see the result by the end of day!