Recently I was brought in to look at a plant and initially we were unsure about what it might be. For some reason Japanese Knotweed sprang to mind and the moment you mention that everyone has a tendancy to panic, quite understandably. Its one of the most invasive and destructive plants we have to deal with, causing a demand for companies who specialise in its removal. We believe now that it is Himalayan Knotweed. After flowering between June and October, the plant forms seed pods 2 to 3 cm (¾ to 1¼ in) long and 8 mm broad (¼ in), which explode when disturbed, scattering the seeds up to 7 metres (23 ft). Impatiens, meaning "impatient", refers to this method of dispersal. There's some interesting info on the Plantlife site here
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Posted by: TP Knotweed | 10/18/2012 at 01:09 PM