The avocado tree varies in size and shape quite a bit now since we have so many different cultivars, but the average tree will generally reach a maximum height of 60 feet. They are usually a low spreading tree. The trees produce many perfect f lowers and the f lower biology of this tree is complicated. Finally, it was discovered that there exist distinct times for pollination and female reception. They function with a synchronous dichogamy which favors cross pollination.
Biotypes exist with floral rhythms which oppose the floral rhythms of other biotypes.
The practical solution is to plant biotypes of differing floral rhythms. Over 700 cultivars have been tried in the U.S. during this Century, of which few have shown real success and promise. Most of these plantations in California fruit in the winter. Lula - A seedling from a Guatemalan race and the male parent is unknown, but thought to be a West Indian. This is the leading cultivar in Florida and one of the two most common in Trinidad where it fruits in September.