Verticulation is the removal of dead plant parts, primarily leaves, from the lawn surface. One part occurs as a result of natural decay and the other part as a result of the mowed leaves, which have not been removed after mowing.

The accumulation of dead plant material hinders plant growth, reduces the power of water penetration into the soil, retains the nutrients in the soil surface, accelerating the development of diseases and pests in the lawn, and prevents the development of the root system. This operation is performed with aerators.