Sprouting an avocado seed is a lot easier than people think - check out this instructable to see how I sprouted this avocado sapling.
Step 1: Keep the Avocado Moist
First, find the top part of the seed (the top part will have a pointy end).
Prick toothpicks into the seed and suspend the bottom half of the seed in a glass of water.
Then place the glass of water in a sunny spot.
Step 2: Change the Water Every 1-2 Days
After a couple of weeks, the seed will crack.
After that a root will appear from the bottom of the seed.
And then after that, the seed will sprout from the top.
This entire process can take about 6-8 weeks.
If none of these steps have happened after 8 weeks then you should try again with a different seed.
Step 3: Plant Your Seed
Once sprouted, you can plant your seed.
It doesn't really matter when you do this and some people grow their avocado seedlings quite tall only in a jar of water.
Step 4: Water Well and Place in a Sunny Spot
And that's it! You've now sprouted an avocado from seed.