Avocado plants grown from ungrafted seedlings may not flower for 10-15 years after planting. Your trees have not been flowering for more than 15 years, so there may be some other issues as well.
This is an excellent resource that covers issues related to flower formation:
http://ucanr.edu/sites/alternativefru...
Posted
by: Sheena Sidhu
(19 points)
Posted: September 12, 2016
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