Posted: 26/06/2012 at 06:34
Having a quick look through Gary's ident I think I'd be inclined to cut your losses Mum, dig everything up and start again. You really need to get rid of the weeds first - especially the bindweed. When I first moved in my current house my back garden looked like that - actually there were less plants. My preferred method of gardening is show no soil. I now probably spend an hour a month weeding using this method. The initial hard work pays off in the long run.
The ones which are plants you can pot up and put back in, though the nicotania is an annual so it is unlikley to survive into next year. I imagine the Aquilega is the common form - usually arrived at by planting a named variety and then allowing it to seed. Initially I'd pull those out too. You'll probably not get them all anyway and they are pretty.
Right off to work now. Typical, since the weekend finished the weather's been lovely!