I had to revive this old thread, I also grow green sapote, Mine is a seedling which was given to me, I've found it to be incredibly precocious and cold hardy, Much more so than Mamey seedlings I have.
I received it april 2012, this is what it looked like
this is what it looked like in march 2013
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and this is it today, late july 2013
Have any of you had luck with fruiting? How do your trees look? can you post pictures?