Answer
Moss
Explanation
Moss is often used as a soil conditioner. The capacity of Sphagnum to keep damp creates the moss a common soil conditioner. A soil conditioner is a material manufactured from organic matter which assists to enhance the soil's characteristics, scoring slow-releasing nutrients. It has been simply used to kill any weed seeds. Mosses are small flowerless plants that typically develop in thick green clumps or mats usually in damp or dark areas.
