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They say this plant only grows in the south of the united kingdom is that correct?
I think it's certainly more common in central and southern areas - Stace says B.nigra is 'very local in Scotland and Ireland'. Another book has it as 'Widespread in England N to Humber, scarce or absent in much of Scotland, W Wales Ireland' (Collins Flower Guide)...
Thanks for that information
Lat/Lng: 52.797, 1.4403
OS grid ref: TG320277