I want to grow grass/grain in part of my chicken coop,
and cover it so the chickens can't eat it until its about 1' tall. I can use chicken scratch unless someone knows of a better product for chickens.

I thought I would cover with something about 1/3 of the coop, and move it once a month.
So, I'm asking if someone can suggest a grain that is nutritious, and grows fast. Or, if the idea won't work as they will eat it down to nothing in a day. The area to be covered is 4x8, and I have 40 hens.