Wow Cyclonenat, you are pushing the envelope of growing down there in Invercargil. Past through there on vacation many years back very nice little town. I would sure protect that white sapote come winter time and needs wind shelter for sure. I've got thirty plus varieties on maybe 12 or so trees and I'm on the Central Coast of Calif. 2-3 miles inland from ocean with cool summer growing conditions. My trees grow well but not like they do inland more where there is heat. So fruit production is not great but we do get some but wish it was more. Endeed up with some many varieties because I went with some other rare fruiters a few years ago down to De luce area in nothern San Deigo area to old CRFG member Bob Chambers White Sapote groves where he has 40 + varieties growing, our quest was to help save alot of these varieties because Bob is getting up in age and future of groves is uncertain. So we all collected as many as possible in one day and shared wood with many calif. rare fruit growers in hopes of keeping these varieties alive. So, any way take good care of that white sapote and best of luck growing
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But as years rack up on this body I finding it's easier to stop planting so much in the ground but plants in containers that's were I need the intervention! 
