+1 for creeping thistle, vetch and a new one on me, goosegrass on steroids! Not something I ever came across in UK but there's this monster that's appeared all over my garden, along with the ivy and brambles that the birds 'contribute'. It's thick-stemmed, trifoliate and very sticky with the most amazing, running yellow roots. But back to the buttercup Glyphosate sorts it
I sprayed couch grass with glyphosate, waited til it died and dried out, then set it on fire. It still came back.
You remember my attempt to get rid of the 90% couch grass that my 'lawn' had become? Three long years, three treatments and it's still poking up here and there I will win, though, if it takes me the rest of my life, which is quite likely
You're not wasting anyone's time. That's how we roll here at GC. We try to be helpful, but at the same time we do enjoy going off on a tangent.
The thing with creeping buttercup is that it manages to creep in the most awkward places. I've got one caught up in the base of a Hypericum, and it has resisted all my attempts to remove it. This makes me realise that l should have recognised it and not identified it as Geum urbanum .
I had a friend in Belgium who was from Zimbabwe and married to a Greek Belgian. He had no interest in gardening and she didn't know European plants. They bought a beautiful, interesting house with an odd shaped and neglected garden. She carefully weeded the beds which left mostly bare soil and some hardy geraniums. Only then did she ask my advice. They were all creeping buttercup! Loads of them here. I hoik them out of beds - easy to pullout of damp soil or fork out of dry soil - and leave them alone in the long grass/wildflower areas. Lots of vetch too which I rather like but not in the beds. Now that we have no access to glyphosate in France, no 1 enemy is creeping thistle.