When do apples and oranges come to animal crossing?

It is a random chance that you'll get apples or oranges depending on when you start a new data. You can also get a different memory card with apples/oranges on it and take some, plant them, and grow your own apple/orange tree. If you have the DS or WII versions then it's still the same thing, just you have to wirelessly hook up with a friend, stranger, ect. Or if you're very lucky, one of your town friends might give you an apple/orange in the mail. But that has like a 1/1,000 chance of happening...