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I didn't know but now I do - it's a Himalayan Balsam

Observed: 7th July 2011 By: RB4742
S159 Neighbourhood Nature - current student
RB4742’s reputation in PlantsRB4742’s reputation in Plants
A plague on the English riverbanks - unknown name
A plague on the English riverbanks - unknown name 1
Description:

A beautiful orchid-like plant that I have seen on riverbanks - known for seeds to travel downstream to re-seed and spread quickly. Grows very tall (I am 5'5) and it has well surpassed me.

Identifications
Species interactions

No interactions present.

Species with which Himalayan Balsam (Impatiens glandulifera) interacts