Compost vs. Mulch: What's the Difference?
In fact, using them interchangeably might negatively affect your garden soil and your plants. What Is Compost? Compost is organic material in various stages of decomposition. The Spruce / Debbie Wolfe The proper balance ofgreen and brown in a compost pileis important. Once the compost is fully decomposed, it becomes organic matter orhumus. You wont recognize any of the original materials any longer. The Spruce / Steven Merkel Mature compost is dark brown and crumbly with soil-like particles, and it has an earthy smell....