the granny smith apple was »born» in 1868 in australia , when mary ann smith discovered a new type of apple by chance when cultivated in your compost pile . the changes ( malus domestica vs malus sylvestris ) grew happily in moist and almost subtropical climate of sydney. the granny smith is crunchy, juicy , bitter and food is natural . its main nutrients are fiber , potassium , iron, zinc and vitamin c.