I understand that one needs a Type "A" and a Type "B" avocado in order to crosspollinate each toher.
Also, they have to flower at about the same time. There are early and late flowring varieties.

Is there a list of T`ypes, so I can check what I have?
I have
Avocado 'Russell'
Avocado 'Lula'
Avocado'Hodgdon'

I live in southwest Florida
Thanks
John Kampion

Russell is type A

Lula is type A

I couldn't find anything about Hodgdon Avos

Avocado Growing in the Florida Home Landscape

Russell Nursery

Here is a nice presentation on avo pollination AvocadoSource