This is the most giblet-shrivelling garden gaffe I've ever witnessed... About 10 years ago, a good friend of mine had a small shady town garden that had a difffcult patch of mixed creeping jenny, mint, and the taller lysimachia that he was sick of. It was maybe 2m square. He wanted a lawn, so rotovated the whole garden (probably 8m square), including the dodgy bit, and then seeded. What he'd actually done, of course, was nicely propagate his problem and broadcast the cuttings all over the entire patch (along wih an astonishing amount of sticky clay subsoil - he wanted to do a 'proper job' after all). Unsurprisingly, the lawn seed didn't take but the 'cuttings' did and he moved within the year... Eek.