My husband has piled grass clippings and chopped leaves in our side yard for 2 years. A few weeks ago, I decided to try my hand at composting. I divided the pile into three sections so that I could realistically keep it turned. I also added a couple shovels of dirt to section #1. Surprisingly, section #1 is "cooking" very well after I started adding kitchen scraps. I'm wondering if the dried out grass still has nitrogen to give or if it is considered brown. At what point to I stop adding kitchen scraps and start another pile with them? Thanks.