Interesting, good friend taught me this method: take the pit from the avocado, placing three toothpicks in the sides of the avocado that will support itself over a container with water. Place it over container so the base of the pit sits in the water. Store this in a cool, dark spot and keep the water level up so that it covers the pit base. Eventually the top will crack, the germination begins and (when the seed cracks and you will notice roots on the bottom) and then, when the avocado starts to grow a few inches - plant it. See link below.