Sheet Mulching

Sheet mulching is a technique used to rid land of existing vegetation, most often lawn, and to build soil. It is a layering technique for composting existing greenery, roots and seeds “in place” while capitalizing on their nutrient values to enrich soil. Because sheet mulching is a method that leaves root structures in place and the Earth’s surface intact, it is a wonderful method for enhancing a soil environment.

The process for sheet mulching is simple and begins with mowing or weedwacking the area of interest then top dressing with soil. The addition of soil (pictured above) brings in microorganisms to do the composting. Next, a single layer of cardboard is placed to blanket the space, blocking out light, suppressing weed growth and providing protection for the newly-inserted microorganisms on the surface. The final step is an application of shredded mulch spread across the cardboard (pictured below), weighing it down, contributing a carbon source, adding another layer of protection, and aiding in moisture retention.

While the cardboard is a carbon contribution to the site, the mowed material adds nitrogen. Over time, the newly-introduced microorganisms carry out the task of breaking these two layers down, fueling their life cycle and in turn making their own contribution of nutrient inputs drawn from life and death. The benefits are tremendous and not only include optimal soil health and a sustainable system of nutrient cycles, but on a more important global perspective, this technique minimizes the need for commercial inputs and additional water. Sheet mulching is a nice way to begin a site transformation.