Answer: Avocado pollination is rather complex which is why you are finding conflicting results on the internet. Avocado varieties have flowers categorized as either type A or type B, depending upon the time of day they open and when pollen is released. For best fruit production your type A Haas should have a type B companion such as Bacon, Jim, Sharwil, Yamagata, or Fuerte. If there are mature avocado trees already in your neighborhood, you may not need to plant a second tree in your yard. Hope this clarifies things for you!
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