I was reading through some posts with pics of raised beds with grass growing in them for the run. I'm ready to build two. My plan is to make them not too high. Put wire on top so the girls don't turn them into mud beds. but grass? Anyone do this? If so what kind of grass seed did you use? Anysuggestions would be great. I'm already growing sunflowers outside of the run for them... multiple purpose- sunshade for summer as they grow and snacks for winter. But the grass is already pretty much gone in the run and I'm not comfy letting them free range where we are in the woods...