I have to disagree with you on the avocados. In certain climates (the KZN region of South Africa for instance) they grow wild and produce prodigious quantities

I have to disagree with you on the avocados. In certain climates (the KZN region of South Africa for instance) they grow wild and produce prodigious quantities of fruits. Most of them don't get harvested and end up on the ground, at least until the dogs find them. A similar thing happens with guavas, to the point that they have been classified as an invasive alien species. They often grow under bridges, apparently spread primarily by homeless people eating the wild fruits.