Pierce the avocado seed with the nail to make three holes evenly spaced around the middle of the seed.
Insert a toothpick in each hole.
Fill the tumbler with water and balance the avocado seed on the top, making sure the bottom of the seed is in the water.
Place on a window ledge.
Soon it will begin to produce a root and a shoot.
As soon as the shoot has a few leaves, snip off the top ones to encourage the plant to branch out.
Pot the little tree when the roots are thick. If you live in a warm climate, you can plant the tree outside.
Remember to keep it watered.
Note: The avocado is an evergreen tree which can grow to thirty feet. There are two main kindsMexican and Guatemalan. The botanical name is Lauracaea.