Dethatching

What is thatch?

  • Thatch is a tough mixture of dead grass and roots that accumulates above the soil surface.

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What causes thatch?

  • Overwatering and incorrect fertilizer application rates can promote thatch buildup; core aeration can prevent it.
  • In a healthy lawn, insects, earthworms, beneficial fungi and other microorganisms break down thatch and aerate the soil.
  • Excessive watering, over fertilizing with nitrogen and heavy use of insecticides and fungicides can decrease the populations of these beneficial insects, earthworms, fungi and microorganisms.

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Why is thatch a problem?

  • Thatch that is more than 1 cm (½ inch) thick can prevent water, air and nutrients from getting to the roots.
  • Too much thatch can also harbour harmful insects and diseases.

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How can I remove thatch?

  • The removal of dead grass and roots that accumulates above the soil surface is called Dethaching.
  • Remove excess thatch with a heavy rake or de-thatching equipment.

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