The main challenge with my Riversearch survey in June was seeing the river – since my previous survey, the plants along the riverbank. have shot up. There were stinging nettles taller than me, and inpenetrable thickets of bramble blocking me from getting close to the river in many places. Still, I did manage the occassional glimpse of the river – enough to see that, though the river level was normal, it was still quite turbid.
There weren’t any particularly exciting wildlife sightings to report, although I did spot some intriguing holes.
I did see a couple of invasive non-native species – Himalayan balsam, as usual, and a probable sighting of Japanese knotweed. This is the first time I have spotted Japanese knotweed along by the river, and I had to use binoculars from the opposite bank to see it, so I’m not 100% sure about my identification. But I’ve shared the photos with the wildlife trust, who seem to think it is knotweed. I don’t know if it’s new here, or if I spotted it this time and missed it previously because I was doing my stretch in the opposite direction to normal. Anyway, that’s now been reported to the National Trust, who own the land, so hopefully they’ll be able to sort it out swiftly.
Japanese knotweed doesn’t look particularly startling (unlike Giant Hogweed), but it can be a big problem, spreading quickly and hard to get rid of. In urban areas it can grow up through patios or conservatory floors, so it’s not something you want in your garden. In the countryside it can quickly overwhelm native species.