Is creeping bellflower. Again, a mesh of roots, but also deep roots. It is absolutely impossible. Does anyone have hints for eradicating? It is, of course, in one of my perennial gardens, sound massive spraying of roundup won't work. I never let it flower, but that doesn't stop it. When I think back, I once ordered an adenophera from a catalog, which I guess was this.
Second worst weed on my top ten