Not always. While you can grow a tree from an avocado seed, it will be very different from its parent variety and may take 7-15 years to begin producing fruit. Fruit from a tree grown from a seed tends to have different flavor characteristics than its parent variety. Known varieties such as Hass Avocados are grafted to preserve their varietal characteristics rather than grown from a seed.
Visit our Grow your own tree section for more information.