Because an avocado tree has both male and female flowers, it can be considered self fruitful in CA and parts of FL, IF THE WEATHER IS IN YOUR FAVOR during its peak bloom time.
Do I Need More Than One Tree?
Well, there's a lot of mis-information regarding avocado tree pollination -- so I guess it's time for a post about pollination issues that matter in this part of North Central FL and Central FL: basically zone 9.
So let me explain a bit.
Type A vs Type B
Our growers are telling us that the avocados we are selling for zone 9 growing are self-fruitful.
But I see a lot of discussion on the Internet regarding type A & type B avocados, and that you need one of each to pollinate the other.
To clarify: Basically, a type A has female flowers in the morning and then those same flowers open as male flowers the following day in the afternoon. And a type B has male flowers in the morning and then those same flowers open as females the following day or day after in the afternoon.
So the presumption is that you need one of each to pollinate to the max.
The short answer is "no: not here."
And that is true if the temperatures stay well over 70° like in the Tropics -- and like much of South Florida. There have even been studies showing a 40-150% increase in fruit set if you have a type A and a type B.
But here in Zone 9 FL, these varieties bloom in Jan to March, and the daily temperature is more likely to be 50-70°, maybe less at night, so the trees are putting out both kinds of flowers at the same time.
And since we're not growing these commercially trying to make 'x' amount of $$ per acre, we don't have to worry so much about maximum fruit set -- there should be plenty to go around with just a single cultivar --- or so I am told.
It all makes since when you understand how the temperature issues influence the type of flower you get.