The Granny Smith apple tree is a popular variety of apple tree that is known for its bright green, tart apples. At maturity, a Granny Smith apple tree typically grows to a height of 15 to 20 feet (4.6 to 6.1 meters) and a width of 12 to 15 feet (3.7 to 4.6 meters). The tree has a spreading, upright growth habit with a medium-sized canopy of oval-shaped, dark green leaves.

In the spring, the Granny Smith apple tree produces clusters of white-pink flowers that are attractive to bees and other pollinators. The fruit of the Granny Smith apple is typically ready for harvest in mid to late October and is a large, bright green apple with a firm texture and a tart, tangy flavor.

Granny Smith apples are popular for use in cooking and baking, especially for making apple pies and tarts. They are also commonly eaten fresh, either on their own or sliced and added to salads or other dishes. The fruit of the Granny Smith apple tree is known for its long shelf life and can be stored for several months in a cool, dry place.