Set up those grow frames, grass frames.. whatever they are called.yep I know grass won't last but I want to give them a natural treat since they can't free range where I am.
Pretty much a deep picture frame with wire across it instead of a picture, so the chickens cant scratch up the grass roots and can only eat the grass blades that make it up past the wire.
You do not want the entire run like that, because scratching in dirt is good for chickens, but a frame or 2 are nice.