Please check with master gardener, from what I have seen this is not necessary, and depending on the type of grass you have maybe very bad for your lawn. Do not rely on the landscaping company for advice, use an independent source, like master gardener. They can be reached by phone or email.
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Personally, we have been here over 5 years, and have not had the lawn dethatched, I was told grass is different here.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
