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Hydrurga, my field guides show three different species of British or European Knapweed; Greater, Common and Brown. Unluckily, your Knapweed doesn't quite match any of them. It needs someone with more knowledge of this species for a positive ID. Regards
Thanks Beagle. In the end Tiggrx came up with what I think is the correct identification, Cirsium pannonicum, a plant commonly found in meadows in eastern Europe, including Slovenia. It would explain why none of the Knapweeds quite matched.
Lat/Lng: 45.78, 13.87