Can you please help identify this plat that I spotted at Floors Castle in the Scottish Borders.
It's a Persicaria. Persicaria campanulata I think
edited September 2018
It loves damp soil and goes mad!
It's very pretty, but I'm in the process of getting rid of mine, as I am scared of it getting into the wild and becoming another pest invader. I have a stream running through my garden and I'm still finding bits of it here and there.
It was perfectly well behaved for the first few years in drier soil though!