I pull a large variety of weeds. If you have a field guide or you can look online at "edible" plants, you may find a lot of stuff you can add here and there. Not everything I give they eat, but they love digging through the weeds to find tiny critters and just hunt and peck. I give lamb's quarters, dandelion, clover, plantain, ragweed, pigweed (wild amaranth) those types of thing. I only have 7 chickens, so there are grasses that I give as well, but I use grass clippers to cut it in very small pieces (I don't want impacted crops) - chickens in a run can't always "nip" small pieces like they may do in a free range setting. I have a suet basket that I can load up with kale/greens for them to pick at, they also like a bundle of kale hung, as well as hanging apple, cabbage, bamboo branches etc., mine love to have things hung up, but I have done this since they were about 3wks old, so they expect something to be hung several times a week. They like to peck at squashes, pumpkin, cantaloupe, watermelon. tomatoes- anything from the garden - you get my drift
Mine also love to dig through pine needles, so I rake some of those up for them. I would only use leaves/pine needles from your own property or source it where you know there have been no chemicals applied. In fall, I bag as many pine needles as I can so I have some to dump in the run for them to dig through in the winter -keeps them busy and smells nice too. Also I know I mentioned bamboo, but I mainly use it in winter-it's usually green all winter, so a bundle hung up when it's cold gives them something to mess with too.
