Definition......Grass mulching or circular grass managementIt is a specific mowing technique that finely shreds the grass into small particles. These small particles are then blown back over the lawn and evenly distributed between the grass. In a perfect situation I would agree. In real life there is a strong tendency for the re-distribution to not occur evenly, resulting in clumping, windrowing, underside deck accumulation and/or uneven cuttings. Many factors influence the final outcome. The equipment, the operator, the lawn health, moisture and terrain all are part of the equation. Any mower will mulch to a degree. Chute blockers and blades are options but not the only determining factors.