The crisp, firm apples were discovered in the late 19th century growing naturally as a sport, or spontaneous mutation in Australia, and with their introduction into national markets in the 20th century, Granny Smith apples have become one of the most recognizable varieties around the world. Granny Smith apples have ranked in the top five commercially grown varieties within the United States and Australia. Granny Smith apples are small to medium fruits, averaging 3 inches in diameter, and range in shape from round, oval, to conical. The skin is smooth, firm, chewy, and thick, remaining bright green when ripe.