I just attended a chicken keeping workshop and got a packet of "Chicken Salad" seeds (various greens) from Derek, the owner of MyPetChicken. My plan is to use either terracotta saucers or plastic long low planters (whichever I find cheap at Odd Lots) and plant the seeds every couple of weeks near my good sunny garden area.. That way I can bring the plants in and out of the run as they need to be reseeded. I have also read about plants that were tasty for them (nasturium), good for insecticide/repellant (mint, sage, thyme, rosemary) and plants that were good to hang in the coop or place on nest boxes(mint, basil, lavendar, lemon balm, parsley). I wil plant all of the in med sized pots and place around the perimemter for their (fingers crossed) heallthful bebefits and to give them for a treat.