Avocado flowers appear in January - March before the first seasonal growth, of about 200 - 300 small yellow-green blooms. The flowers are perfect, but are either both receptive to pollen in the morning and shed pollen the following afternoon (type A), or are receptive to pollen in the afternoon, and shed pollen the following morning (type B). About 5% of flowers are defective in form and sterile. Production is best with cross-pollination between types A and B. The flowers attract bees and hoverflies so pollination is usually good except during cool weather. Off-season blooms may appear during the year and often set fruit. Some cultivars bloom and set fruit in alternate years.

Image and videos courtesy of www.ucavo.ucr.edu