MichaelZ wrote: I've enjoyed starting avocado seeds for years. I use them as a house plant and when they die they get composted. Not sure they would survive as an outside tree in this climate. The planting advice above is correct. I have recently learned that topping the plant/tree would make for a more bushy plant. It works.
I think that if you want fruit you need at least two trees to cross-pollinate.
Attached is a picture of two of my avocado plants. The one on the left is lopped and the one on the right is not.