I have 24 hens, 4 breeds. At a week or so, I started giving them garden waste along with their grower crumble. One of the things I gave them was beet stalks and leaves cut up real small. They loved everything I brought them, inclluding the beet sprouts/leaves. Other things were radish stalks/leaves, lettuce scraps, tomatoes that may have had spots, that I cut out. Also they got cucumber scraps, melon scraps, cantaloupe scraps and cabbage. They love it all. Apple peelings, carrot peelings, sweet potato peelings, bell pepper scraps and especially the seeds of the pepper plant. I used to whistle when I brought food. Now I can whistle when I approach the pen area and they stampede to the gate from wherever they are in the 2,000 sq ft pen.
They look at 14 weeks like they are big enough to begin laying any day, but I have no idea when they will start.