Which of the following materials is typically considered a green (nitrogen-rich) material in composting?

• A. Kitchen scraps
• B. Dried leaves
• C. Straw
• D. Wood chips

Answer: (A)

In composting, nitrogen-rich greens fuel microbial activity and help the pile heat up, while brown materials provide carbon and structure to keep the pile aerobic and balanced. Kitchen scraps are a classic green material because they are high in moisture and contain substantial nitrogen from plant proteins and other organic compounds, so they decompose quickly and drive rapid microbial breakdown. Dried leaves, straw, and wood chips are mostly carbon-rich browns; they add bulk and improve aeration but break down more slowly. So the kitchen scraps are the typical green material in a compost pile. To keep things functioning well, mix greens with browns to maintain a good carbon-to-nitrogen balance and avoid odors.