Answer
When can I first mow a new lawn?
Once rooted and around 5 to 8cm, a few weeks after laying; just the tips, on a high setting.
In short
Once new turf has rooted and reached around 5 to 8cm, usually a few weeks after laying, take just the tips off with a sharp blade on a high setting. Mowing too soon or too short sets it back, so it pays to wait until it has rooted.
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