You can seed the bare bits, but the issue of the deep roots is going to end
up with a very bumpy lawn, just like mine.... Brian

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"ss" wrote in message
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On 06/12/2019 22:12, wrote:
Apply a selective weedkiller to kill just the dandelions and hope the
grass then regrows and fills in the space left by the dandelions

Above is what I would do.