re: What fruit trees have you had success with in south Louisiana?

South shore of Lake Pontchartrain (Old Metairie):

Persian (regular) lime tree does REALLY well. Key Lime tree produces only about a dozen fruit each year. Bananas will fruit on new stalks. Neighbor's orange tree on the fence line produces beaucoup oranges, which are only good for juice (delicious, but far too many seeds and not easy to peel)