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More scarifying 2-3 passes . regular aeration and reduce your nitrogen application dose.
Its got to be a heavy duty scarification in my book.
to play safe, half depth now, rest in spring & ensure a harsh winter doesn't knock it back ....or, ....you have a decent root depth if you wanted to go for it all now & top dress/ fertilise......but there is a decent bit of waste to come out and your customer may not have the stomach for what that may cost!
Thanks both - it’s a pretty big lawn so a big job across the full area.
Taking over new gardens, we often find this problem and it really isn't easy to eradicate, so before takling or promising too much, I'd take a deep breath and discuss with the customer. Regular coring and heavy scarifying help, as you neeed to get the roots into the soil, most here are in the thatch.
Thanks Colin, I’m really not sure the customer has the appetite for a big ongoing repair job but at least I know that’s what I’m looking at should she want to tackle it.
Image update.
With Chris - scarify harder, areate with hollow-tines, areate with solid / slit / fracture to follow. Consider Mo-Bactor type products rather than chuck on anything else. It's unlikely to be making it where it needs to be anyway!