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Unknown plant - anything invasive?
Observed: 4th November 2012 By: andrewktaylor
Added: 5th November 2012
Growing in a large stand - stand roughly 15 metres long, 4 metres deep, 2 metres high, along the bank of a small woodland stream on Dartmoor, altitude about 1000m. On the edge of a large nature reserve. Doesn't look quite like knotweed. Is this something invasive that the reserve owner should be concerned about?