Location: Cambridgeshire, UK.
My new-build lawn grass has patches with really woody stems that make the lawn look patchy and unattractive. Is it a weed or something that happened to the regular grass? My plant identification app failed.
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There are two possibilities as follows - 1. these hard stalks have formed because the grass hasn't been cut for so long or 2. you have some meadow grass mixed in with your lawn. Meadow type grasses form clumps, grow faster and are often tough at the base. Since we can't see what the grass was like before it was cut, I suggest you mow it again when it needs it in the next couple of weeks and watch how it develops over time - the tough stems may disappear, but if not, leaving it to grow for a bit later in the season should allow any meadow grasses present to be more obvious. If there is meadow grass, these will need to be dug out, roots and all, the holes filled in with garden soil and then seeded on top - there is no weedkiller that selects for specific types of grass.