An Australian apple developed from an apple discovered growing in a compost heap in Sydney. This green apple is now growing all over the world. It has a tart flavour. Great to eat fresh and good for cooking too.
This apple was named after Maria Ann Smith, who propagated the cultivar from a chance seedling. The tree is thought to be ahybrid of Malus sylvestris, the European Wild Apple, with the domestic apple M. domestica as the polleniser. The fruit has hard, light green skin and a crisp, juicy flesh.
Granny Smiths go from being yellow to turning completely green and looking almost like grass. The acidity mellows significantly, and it then takes on a balanced flavour. [ Source: Wikipedia ]