I have a 5 -6 foot avocado bush that I started from a seed that has two main stalks at roughly the same height. The trunk on both are about 3 inches. I started the avocado on a whim, but now has started my fascination with gardening. I live in the San Francisco Bay Area near the coast where it doesn't get too hot, which I know may not be the best climate for avocadoes.
I'm new to growing fruits, so wanted to know if it was possible to graft a variety that could potentially flower and fruit in my area. I love my tree and I want to bring it to its full potential by growing fruit on it. I heard that the mexicola is very vigorous in fruiting and cold hardy, and was thinking that maybe this could be a potential variety since the milder climate would only slow but not stop its vigor (maybe?). also I know that I probably need both A and B flowering types to allow the best chance of fruiting but since I have to two main stalks I thought this might work out. Does anyone have experience with growing avocado in milder/cooler climates, or of which varieties might be good candidates/pairs?