So i found a mango tree that is located in Santa Clara that is 15+ years old, at least. You can go back on timeline and see that it was pretty damn big even in 2009.
Sterling InnI have 3 mango trees that im growing in 15 gallon smart pots in my backyard. An Alphonso and a Rapoza/Raposa from Plantogram, that i assume are on turpentine rootstock. And a manila that i got from lowes. I got all of these last June, and so far they've made it through this winter without any protection other than stakes for the wind. The lowest it got in my yard this year is 36 degrees, for about an hour. We'll see how this week coming up goes but i assume the cold and rain wont phase them if they made it this far. I even had like 15 seedlings in one gal pots that i left out in the open all winter to test if they could take the cold. So far only 1 died to rot from being to cold a few weeks ago. The rest have taking off from the heat these last few days.
Im growing all this on the west facing side of wall that is on the foot of a hill. They get direct sun from 8am/10am, depending on the season, until sunset. I think is what has helped keeping them warm and from dying.
The only problem ive run into so far is that a lot of my new growth has been staying yellow and not turning green even though i have been fertilizing with EB Stone citrus mix. I didn't know that it does not contain enough micro-nutrients and had to supplement them with Greenall FST.