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why has he got green patches?
I suspect it is smuggling duckweed to some other poor unsuspecting gardener's pond!
Roger's right - the green patches are duckweed.
Ah! so that is how duckweed arrived suddenly in my garden pond last year. I have lots of frogs and now lots of duckweed, but no ducks. Must get one of those Duck Islands to encourage them.
University of Edinburgh and Biodiversity Observatory (OU)
Lat/Lng: 52.7, 0.3
OS grid ref: TF5820