I just got my first chicks and have a few questions about the run. First, what is the best groundcover? It is being built over a portion of my former vegetable garden. Would lawn seed or one of the wildflower mixes work best? It's a 10' x 10' fenced in square. Also, do chickens use the run during the winter or do they remain in their coop? My coop is 8' x 10' and 7' high and connected to the run. If they use the run in the winter, should I cover the top of it with an angled tarp to keep snow out or will the chickens run around in the snow? I live in Michigan.