Organic mulches such as grass clippings add beneficial microorganisms to soil as they decompose
https://www.slideserve.com/elwinncobf/a-beginner-s-guide-to-hardscaping-materials-and-their-uses-with-mulch-14357703
Organic mulches such as grass clippings add beneficial microorganisms to soil as they decompose, improving soil structure and fertility over time.