When to introduce greens to chickens

[Mr Pilo]

Besides purina and all those bags feed, when can I introduce greens to week old chicks

 

[Wyorp Rock]

As long as they have grit, you can give them some greens now. I wouldn't expect week old chicks that are in a brooder to really eat much greens, they may pick at them a little for some entertainment.
Unless with a broody, I've found chicks really don't eat greens until several months old, so if I want to give something besides their chick starter, I give a small amount of scrambled egg.