Hi,

Can anyone tell me what the weed is that is thriving in my pond?

The weed is green and floats freely on the surface of the pond. As far as I
can tell, the leaves are oval (around 3-4mm long and 2-3 mm wide). They have
a look which I think is reminiscent of the leaves of watercress but they
have no stem.

I've seen this weed on covering the surface of canals in the UK and as a
child, I seem to remember that we called it "Jinny Greenteeth"

TIA
MikeB