Dethatcher
Thatch removal (dethatching)
Scarification or de-thatching of lawns or turf is a mechanical process whereby the surface and subsurface of the lawn, green or sports pitch is rigorously abraded by penetrating metal blades, tines or prongs.{{Cite web |last=Carrick |first=Tony |date=2022-08-31 |title=Dethatching Leads To a Healthy and Properly Maintained Lawn—and These Blades Make It Cheap and Easy |url=https://www.bobvila.com/articles/best-dethatching-blades/ |access-date=2025-06-05 |website=Bob Vila |language=en-US}}
The process is usually carried out by machines of a professional standard which are normally powered by gasoline engines. Smaller, less rigorous electric machines are also available for the domestic market. The process of scarifying is designed to remove thatch from lawns.{{Cite web |date=2025-04-14 |title=No More Excuses: Our Favorite Dethatchers Are Easy to Use and Keep Your Grass Healthy |url=https://www.popularmechanics.com/home/lawn-garden/g35873527/best-lawn-dethatchers/ |access-date=2025-06-05 |website=Popular Mechanics |language=en-US}}
Thatch is a build-up of organic matter which can include dead grass, leaves, stems, stolons, rhizomes and overcrowded grass roots and lateral weed growth. Thatch can stifle the growth and health of grass or turf. Removing the thatch helps the grass by encouraging it to thicken up and also makes it stronger and less susceptible to disease. Reducing thatch levels increases the levels of water, air and nutrients that can get through to the root zone of the grass plants.{{Cite web |title=How to Know When Your Lawn Needs Dethatching—and the Best Time of Year to Do It |url=https://www.realsimple.com/when-to-dethatch-your-lawn-8709577 |access-date=2025-06-05 |website=Real Simple |language=en}} Significant thatch problems in lawns can cause diseases and can encourage moss to grow in the areas where grass has died. A by-product of scarifying or de-thatching is that moss is also removed, and depending on how deep the scarifying blades are set, root cutting can also occur, and this in turn helps grass to thicken up over time.{{Cite web |last=Dickson |first=Chiana |date=2022-09-11 |title=How to dethatch a lawn – and how to prevent thatch forming |url=https://www.homesandgardens.com/gardens/how-to-dethatch-a-lawn |access-date=2025-06-05 |website=Homes and Gardens |language=en}} Scarifying is normally carried out in autumn or spring.{{Cite web |last=King |first=Sophie |last2=Hesikova |first2=Sara |date=2023-11-22 |title=When to scarify a lawn for thick, healthy grass – now's your final chance before next year |url=https://www.idealhome.co.uk/garden/garden-advice/when-to-scarify-lawn |access-date=2025-06-05 |website=Ideal Home |language=en}} When scarifying or de-thatching, not all thatch should be removed as a small amount of thatch is beneficial to the lawn. A lawn that has excessive thatch may feel spongy when trodden upon. After removing thatch, it can be swept or raked up using a lawn sweeper.{{Cite web |last=Brougham |first=Rachel |date=2019-07-26 |title=Lawn Sweepers: Worth It or Waste of Space? |url=https://www.familyhandyman.com/article/what-is-a-lawn-sweeper/ |access-date=2025-06-05 |website=Family Handyman |language=en-US}}
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