Avocados do not come true from seed and many never produce fruit. I take calls at the Extension Service and have had several questions from folks who have huge trees in their landscape that do not produce. I always ask if they grew the tree from seed and the answer is always yes. This is such a large part of the landscape I always recommend buying a grafted avocado tree from a quality nursery. It may cost $20 but that is a lot cheaper than paying a crew to cut down a 50 foot non-producer.
Jim
