answer:Commercial avocado trees are propagated by grafting of budding scions of desirable cultivars onto seedling or grafted rootstocks. Avocados can be grown from seeds, but fruit quality and yield potential will be quite variable. Grafted or budded avocado trees usually produce fruits when three to five years old, while seedlings often require five to seven years. Source Apparently, you can, but the results may not be predictable. (Did you know that apple trees grown from seeds are wildly variable and unpredictable? “The Botany of Desire” is one of my favorite books.)