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@mespilus
Apologies to all.
The floating aquatic plant we saw in big swathes across the canal
was not escaped 'water cress',
but floating pennywort, an invasive pest.
My Conservation Group has recently been invited to apply for funding
for voluntary groups to remove it from any Local Nature Reserves they manage,
and,
speaking to the Project Manager,
we have been invited to clear a stretch of the River Colne,
downstream of the weir we saw,
(that marks the beginning of the man-made River Frays).
Await an invitation to a day messing about in a (shallow) river
removing the unwanted floating pennywort.
All invited,
and we will be working adjacent to the Denham Country Park visitor centre
with full amenities, rather than miles away from a WC.