Reported in the Parks/landscapes category anonymously at 17:25, Thu 21 May 2020
Sent to Bristol City Council less than a minute later
I'm not much good at botany, but I suspect this is Japanese Knotweed. It's on the footpath next to the river behind the entrance to Springwater Park Trading Estate on Crew's Hole Road. The second photo is looking away from the plant towards that entrance.
Provide an update