I'm a South FL native. I've got some very drought resistant/hearty plants and herbs growing here with little care. Moringa, malabar spinach, quinoa, calaloo and cherry hibiscus for greens. Fruit trees: Papaya, mango, lychee, strangler fig. Herbs: rosemary, mint, basil, fennel....... Many plants can take the summer heat under a thick layer of mulch and sandy soil can most def. be improved.