Sweet potatoes! The vines are edible and tasty and the vines grow so fast that it would suit your setup well, and at the end of the season you can dig the tubers to cook and eat yourself or feed to the chickens. Marigolds would be a good flower to try, it's said the flowers give a good color to the yolks (although most of my birds had onlt moderate interest in eating the flowers).I posted this elsewhere but thought you might be able to give me some ideas. I am building my run and coop. I am planning to plant around the inside edge of it and put a board around it topped with wire so my girls could only get to so much of the plant and not kill it. I plan to put lettuce, peas, chard, parsley, purslane, strawberry and chickweed. Any suggestions on others to plant would like a few more herbs and maybe a couple flowers? Thanks.