How to grow avocados is a question with a few answers possible. First it depends on how soon and if you want the tree to fruit. Grown from the seed an avocado fruit will take about ten years to mature and bear fruit - and this will only happen if.
HOW TO: Grow an Avocado Tree from an Avocado Pit...
When the stem reaches 12 inches tall, pinch out the top two sets of leaves. This will encourage the plant to grow side shoots and more leaves, making it bushy. Each time the plant grows another 6 inches pinch out the 2 newest sets of leaves on top.
Summer of 2016 - This worked the best - I tried 3 different ideas. Starting an avocado from seed can be difficult when you sprout it in water. This almost foolproof way to start the avocado seed is much easier as well as more successful.
Grow A Plant From An Avocado Pit--- Did you know that if you save the pit from an avocado, you can grow an indoor tree from it? You’ll need a pit from a very ripe avocado, wash it well to remove any traces of fruit and then allow it to dry for a few days.