DessertSativa,
I've grown in-ground in FL, but I live in more in the central part where the water table is much deeper so no prob. As a personal note: I don't take kindly to developers. (J/K, well sorta, where I grew up use to be nearly all sticks, now housing tracks and dollar general shopping centers are popping up all over ruining Florida's attractive, and irreplacable, natural/beautifull ecosystems.) From what I have heard from some one who grew on one of the MILLIONS of islands in the gulf, you can grow in high salt environments. It just (according to this guy, who only did it twice) comes out poorley developed. He heavily and deeply ammended the soils, and since the island was moderatly close to shore, he had sealed jugs of fresh h20 stocked. Again, he said the quality was medium, so I take that as "not worth the effort." But again, this is just hear-say, in actuallity it might not have happend.