striking yellow flowere in boggy riverside marshy area - dont know what it is!
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Where did you see this? If it was in the UK, then it was either planted or maybe a garden escape.
University of Edinburgh and Biodiversity Observatory (OU)
It was in a bit of boggy marshland alongside a stream on a bit of wasteground in meltham, West Yorks, although in a sheltered spot.
Thankyou kindly for the identification, it wasn't in any of my wild flower books and now I know why!
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Its a fairly common garden escape and increasing I suspect, have seen it in various parts of uk from cornwall to kent, in most cases beside damp wooded streams not far from large gardens that perhaps should know better than to let it escape.
Do you think it is a bit of a self-seeding pest?
At the moment this species is not a big problem but it is very difficult to predict which species will become invasive weeds as some species hang around for many years doing not much then suddenly start spreading.
About half of the British flora has been introduced by man rather than having arrived here naturally after the last ice age. However a number of the species that have arrived over the past hundred or so years have become serious weeds e.g. japanese knotweed, giant hogweed, costing local authorities etc millions of pounds to control.
Lat/Lng: 53.5, -1.9
OS grid ref: SE1010