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Maybe you need to check your astrantia is an astrantia
Some leaves and a sense of scale would help
I like the water and the oil of cloves idea better than killer chemicals
I'm sure it's a persicaria. That one seems quite likely
Before you go down the spray route, consider all those beneficial insects you might kill.
I think you'd need a closer view of the leaves for an ID.
Have you got a photo? Conifers all have a period in the year when some of the older leaves go brown and die off. Do the new shoots look OK?
Definitely willow, probably Salix caprea
The russian vine would win
I think if you want to grow anything more interesting it will have to go.