They're hideous things to get rid of @rosemary1mackenzie I'd get hold of that stump killing stuff if you can- I can't recall it's name but I'll see if I can find it. I'm not sure ordinary weedkiller ever does the job. It's not really the right time of year to apply, but worth a shot.
Miscanthus is a better bet all round I think. But I do like Pampas in the right context. There are some more compact types but they look a bit cramped and stiff to me, they need space imho.
"What is hateful to you, do not do to your neighbour".
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I'd get hold of that stump killing stuff if you can- I can't recall it's name but I'll see if I can find it. I'm not sure ordinary weedkiller ever does the job.
It's not really the right time of year to apply, but worth a shot.
This stuff
https://www.amazon.co.uk/Vitax-5BKTS250-Stump-Killer-Concentrate/dp/B07NWZ8TFT
You need to wait until it's gone before you plant anything else though - personally I'd leave it over winter to be safe, and prep all the ground first
I live in west central Scotland - not where that photo is...