I have some 4 week old chicks. Would it be okay to go out in the backyard and get a clump of grass for them or is it too soon? Also would they need some grit to help digest it better? With dirt or without the dirt in the clump of grass? I wanted to put something in their room they could eat but get entertainment out of it by scratching it and pecking at it too so I thought a clump of grass would do it. I have given them a variety of mixed nuts meshed up finely so the grit wasnt needed but wasnt sure if the grass they would need grit. My day off and Im avoiding going to the feed store if I dont have to leave the house and wanted to stay in where its warm and comfy.