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Water Mint would have an obviously terminal, globular inflorescence, which this does not seem to have. Mints are difficult in the hand, so photos are approaching impossible!
Hi Circuta -
I did think this might be a problem, but though that maybe the 'terminal inflorescence' hadn't yet flowered! Guess I'll just have to have a check on it again!
What else could it be, given the leaf shape, the hairy stem & leaves, the smell of mint and its watery location? I'd be interested to know what its possible id could be.
There are several possibilities including M. x verticillata and M x gracilis.
Thanks for info.
Lat/Lng: 53.6901978, -2.3371522
OS grid ref: SD778215