In my view Alopecurus geniculatus & Silverweed means waterlogging, Red Fescue could grow next to that patch if topography and/or sediment type enables a drier environment. Saying this I've not seen every site!
That would be my view, Festuca rubra subsp. litoralis and an ecotype of Agrostis stolonifera are both in the least inundated upper saltmarsh, Festuca rubra may in floodplains grow where sediment is more free draining (sands, gravels) or on higher parts of topography, could be in close proximity
Never bet against Festuca rubra, the limestone heath population one of the most waterlogging tolerant interesting speculation on past environment of the site which may have resulted in this population developing a greater tolerance, the reality may be a patchwork of populations some of great
to lower topography (clays) more prone to being wet dominated by Silverweed, perhaps to a degree it depends on area sampled, large enough plot small scale wet hollows mix in with slightly raised (maybe sandy) topography.
Despite that not a species showing particular high tolerance to flooding/waterlogging.
longevity with local adaption.
I think giving people an idea of how to reduce their own emissions is a positive thing, but the overall problem is fundamentally one that requires SYSTEM CHANGE, and making it seem like it is solely the individual's responsibility is ultimately counterproductive.
openurl.ebsco.com/EPDB%3Agcd%3...
Festuca rubra is complex, I'd not be surprised if an 'ecotype' tolerated more flooding, but this study did not show much tolerance.
onlinelibrary.wiley.com/doi/10.1111/...
