My daughter planted an avocado and it is growing like a weed so I decided to try to plant my own avocado. As she did, I took the pit from a ripe avocado and put toothpicks in it. This was back in April
It took a while before it opened and roots started forming.
When I checked it in August guess what I saw? A new formation starting to come out. Looks like the plant is being born.
Finally got to plant it! Once it got to 5″ I cut it half way down. Hope it grows back.
Dec 15/2016 update.