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Granny Smith Apple Trees produce a lush green fruit with a tart taste and a firm and crisp texture. The apples are medium to large-sized and ripen in August through September. They are excellent keepers once theyve been picked and are perfect for eating fresh or for cooking with. Granny Smiths require 400 chill hours and are self-pollinators. for planting, apple trees prefer full Sun and slightly acidic soil. At maturity, the Granny Smith apple can reach a height of 12 ft. to 14 ft. and width of 14 ft. to 16 ft.