I've been giving my girls spinach for years. I get a big bag at Costco and throw out a bit most days. Sometimes I give them yogurt, which they also love, plus melon in the summer. This is in addition to their laying crumble and a small mix of scratch in it. Lots of variety but mostly their main diet. Like us, they like a variety.My girls are still laying a few eggs every day in spite of the short days of light. An `old timer` chicken farmer told me the best way to keep them laying is to feed them fresh spinach every day. We tried it and it works !!!! Simple.