This sequence of shots shows how rapidly duckweed spread across this stretch of water. View the image in the original size to see it properly with dates
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Lemna divides vegetatively, which is how it is able to spread so fast. Population growth may well have been exponential over the first 2 weeks of June.
University of Edinburgh and Biodiversity Observatory (OU)
This is probably still on your patch.
How's it doing after 4 years?
And did you check?
I am still trawling through some history.
I have continued to take photos every time I pass the spot, but have not done anything further with them.
Lat/Lng: 52.0, -0.8
OS grid ref: SP8835