No matter the size of your run, you can have it be a healthy environment for your flock, instead of it turning into a stinky, barren moon-scape. As they strip the vegetation, and eventually, they will. (I've had my flock of 16 - 25 in a 1600 s.f. electronet run, and they did strip the area around the coop, while the grass remained in about 2/3 of it.) I recently built a 500 s.f. permanent run which can be covered, due to hawk predation. Because it was new construction, after land was cleared, there was very little vegetation. My immediate goal was to cover every sq. inch of that run with 6" of organic matter. I've used shavings/poo shoveled straight out of the coop, lawn clippings, and added many bags of leaves, garden debris, wood chips, and a few bales of hay. Job is far from finished. But, when flock is confined to the run, they have a nice layer of detritus to rummage through for the many bugs and worms that will be attracted. This layer will also be heavy in the microbes and fungus that contribute to a healthy gut flora in the flock, as well as decrease the risk of internal parasites. The poop will mix into this mixture as the whole layer gradually (and you'd be surprised how quickly it actually does happen!) melts into the ground, creating a healthy compost and humus laden soil. If my flock were confined to this run every day, I'd build a couple of growing frames, covered with wire and seed them to a mixture of chicken friendly forage crops. Add some multi height boredom busters, as well as a chicken swing, and your flock will be so busy they won't have time to get bored.