I am having the same problem with my new flock. They are 10 weeks old and only like oatmeal. So far, most greens are ignored except kale. These are RIRs and maybe they are just that way. They seem to hang out in the coop a lot more than my last bunch, which were Golden Comets and BOs. They are very healthy looking so I guess I shouldn't be too concerned, but the treats from the garden are free and would help offset the cost of chicken feed (prices are awful right now).