Mike, this link should pretty much answer your query.
Hi
How many seeds you have to germinate to get male and female trees and in what age can you distinguish male and famale? Thank you
Msk unfortunately I can't verify that info as all I know about it you can read in the thread for yourself:) I have heard from other sources that the ratio favours more females but again that's not first hand knowledge of mine.
My oldest tree is 5 years old and hasn't flowered but. I have overwatered, damaged roots when repotting and stunted it alot before I learnt more about good pot culture ha ha.. it has put on more growth in the past year years than all four years before.
They don't grow naturally in my area as it's only gotten warmer here in the past 20 years or so, we can grow lots of stuff we never could before. It's hasn't blinked at the temps here light frost in winter and up to 35C in summer but could have grown much faster in the lowveld climate I am sure. I can't give much more info than that as I only really encounter wild trees. Usually if land is cleared they leave this tree cause of the fruits but more extensive cultivation than that I havnt seen. Farmers here are very western produce orientated and there is little interest in indigenous fruits sadly.This plant is mainly known for a very tasty cream liqueur called amarula. I'm not sure if the producers farm those trees or not.
They grow starting like 100km north of me in beyond in starting in what is known as the lowveld (I live in the highveld with a much higher altitude bringing colder weather)
The wild ones though makes so many fruits without fertiliser they carpet the floor. I can't wait to see what some thinning and fertiliser will do! I want to grow very many when I get land and select for the best of fruits:)
I also know that one male can pollinate many females, my future plans are to experiment with grafting a male branch on. I also have younger plants I grew two or three in the same pot then braided the stems, hopefully the trunks will mesh and the odds are in favour of one being female.
A cool thing about the seeds is one seed often sprouts two plants but I assume they would then be the same gender so those I separated.