Yams (not sweet potatoes) are delicious and have lots of calories. A true survival food. You need a place for them to climb, they grow quickly and need space to go up. No work at all is needed besides putting them in the ground. If you have a tall tree, plant one nearby. I like to plant them around fruit trees so I get 2 crops. The purple pigment makes eating them more fun and more healthy, since colors in natural foods are antioxidants. Whoot!
Palm Tree Urban Farm 