good plan Janabelle
Not sure that there's a weedkiller that would kill sedge without killing grass
one of the sedges I think. Usually damp ground plants so improving drainage might help
I'm sure someone can help Metalmama but gerberas and the like are not something I know about
1 ragwort, out
2 Dock below the foxglove, out
3 could be a scabious and far too many slug pellets, consider the wildlife and the food chain.
4. can't remember its name but a weed, out
They're perennials but not bulbs, they have a tuberous root which can be stored over winter like dahlias. They come through mild winters in the garden but are so slow to start it's not worth bothering with. They're so quick and easy from seed, I save seed and start afresh. But I haven't grown them lately, too much not terribly attractive leaf and not enough flower. Though they do smell nice
What a dfifference.
I'm afraid they look seriously dead to me.