Hi. Our four hens 'free range' in the back half of our yard (the yard is fenced in half to keep the girls in the back) and over time, they have eaten and scratched that back half of the yard completely clean of any grass. From time to time, I will open the gate and let the girls roam in the front half of the backyard so they have the ability to eat grass but I don't do it too often as I don't want to lose all of the lawn. My question is, how important is it that they eat grass and how often should I let them have access? I was thinking of throwing down grass seed this spring once the snow melts but I doubt it will have the opportunity to grow. Any thoughts / suggestions? Thank you!