If there are no other varieties of avocado tree nearby, your avocados may not have gotten pollinated. If the flower doesn't get pollinated, it will fall off. Avocados fall into 2 pollination groups. You should have at least one variety from each group to get the best results. Of the varieties commonly grown in California, group A is comprised of: Anaheim, Hass, Mexicola, Pinkerton, and Reed. Group B is made up of: Bacon, Fuerte, Nabal, Stewart, and Zutano.
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