Source: University of California Agriculture and Natural Resources

Avocado Male & Female Flowers

Avocado trees self-pollinate. However, there is a possibility that planting trees of flower types A and B can lead to increase pollination and fruit yield.

The avocado’s flowering behavior is believed to promote cross-pollination since the male and female phases of an individual flower occur at different times. It is believed that the interplanting of complementary flower types can boost fruit set and therefore yield by making pollen available.

There are two flowering types, referred to as "A" and "B" flower types. "A" varieties open as female on the morning of the first day. The flower closes in late morning or early afternoon. The flower will remain closed until the afternoon of the second day when it opens as male. "B" varieties open as female on the afternoon of the first day, close in late afternoon and re-open in the male phase the following morning.
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