I've been working on compiling a survival plant database that's comprised of mostly perennial vegetables. We've been doing it in Costa Rica for a couple years not and learning a lot. It's crazy how productive you can be with such little input in a tropical area! These amazing perennial crops in addition to our aquaponics system have made the homestead really productive. Moringa, Katuk, cuadrados, camotes and Sisoo spinach some of our most useful producers. http://survivalgardener.com