Pennywort Status

For a detailed log of current pennywort status click here

The maps below show the status of pennywort on the Upper Cam at the year end (December).  Zoom into map and click on markers for more detail. See map key below.


Dramatic improvement in the pennywort situation, thanks to intensive work by contractor and volunteers during 2018. Small hotspots remain at Grantchester Mill Pond, Swan Island ditch and Snobs Stream, but otherwise there’s no visible pennywort at the year end.  We’ll need to remain vigilant in 2019 though, especially once the growing season starts, to make sure we haven’t missed any, and to complete the eradication in the hotspots



Chilling video of kayakers pushing through the pennywort at pinch point 2 on upper Cam on 4 Dec 2016

Map key:

Turquoise: Clear of floating pennywort at year end, but present during the year.
Orange: Occasional patches of floating pennywort.
Red: Frequent or continuous mats of floating pennywort.
Black markers: Completely covered by floating pennywort, at least once during the year.
Turquoise markers: Upper limit of floating pennywort.

return to top