These are the two species that are out of control at the lower end of this watercourse, himalayam balsam (with purple flower) and white buttleburr (with rhubarb-like leaves).
I reckon that there are 20,000- 30,000 square metres of invasive species in the bottom 2.5- 3 miles of this watercourse alone, almost beyond control now, and simply taking over the riparian environment.
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