lawn thatch - Knowledgebase Question

Aurora, CO (Zone 5A)
Question by clrosen
July 20, 2007
We are considering de-thatching our lawn. Is it better to de-thatch in the fall or should we wait until next spring?

Answer from NGA
July 20, 2007


Dethatching is a practice used on mostly warm-season lawns that produce heavy woven mats of stolons or runners. It's done in spring before the lawn gets off to a new start. The steps, in order, are: 1) scalping -- setting the mower as low as it will go and taking the grass to within 1/2 inch of the ground; 2) dethatching -- using a rented machine that rakes the mat of runners right out (hand dethatchers are available but they are not efficient and can wear out the best of us if the lawn is large); 3) aerating -- using a rented piece of equipment that removes small plugs of soil which you then fill in by raking compost across the lawn.

I'd wait until next spring to dethatch so your lawn will have all spring and summer to recover and grow thick and healthy before winter sets in.

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