@Fairygirl alright thanks a lot, I’ll do that tonight after work. And yeah I used two spray bottles of weedol as well as using a fork to remove particularly stubborn ones by hand. I don’t know if there was anything else I could’ve done. Still, I’m happy with the way the grass looks and will mow it and see if that helps.
The problem with many persistent perennial weeds is that you have to give the weedkiller enough time to get to the roots, and get those killed off. It might be that you didn't wait long enough before prepping and sowing your new seed, and it was only the top growth that had died back. Those types of weeds can grow away again surprisingly quickly, and from what appears to be completely dead. Hopefully, you'll be able to get on top of it though. Next year, if not this
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
The only things I would add to what everyone else has said is make sure your mower blade is properly sharp as well as set as high as it will go. You just want to snip off the tops for the first few cuts, then you can lower it a little at each cut if you want to, but don't go very short. And collect the clippings for at least this year even if you have one of those mulching mowers that chops it up small and leaves it - you don't want to swamp your new grass with clippings.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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Those types of weeds can grow away again surprisingly quickly, and from what appears to be completely dead.
Hopefully, you'll be able to get on top of it though. Next year, if not this
I live in west central Scotland - not where that photo is...