For a healthy lawn it is recommended to scarify each year. Moss and dead mown grass cause a thatch. By removing the thatch you ensure that air and light will get onto the turf. Scarification or de-thatching of lawns is a process whereby the scarifier tines will comb through your lawn and pull out any thatch and moss whilst cutting into the surface of the soil with penetrating metal blades.
Thatch is a build-up of organic matter which can include, dead grass leaves, stems, and overcrowded grass roots and lateral weed growth. Thatch can stifle the growth and health of grass or turf. Significant thatch problems in lawns can cause diseases and can encourage moss to grow in the areas where grass has died. Scarifying also removes moss and is normally carried out in autumn or spring. When scarifying or de-thatching, not all thatch will be removed as a small amount of thatch is beneficial to the lawn. A lawn that has excessive thatch may feel spongy when trod upon.
After scarification lawns need to be watered and a fertilizer applied to ensure a speedy recovery. Dependant on the condition of your lawn, overseeding and/or top dressing are optional extra services to help to give you a fuller, thicker lawn.