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This plant has been declared an invasive weed in Australia and I imagine it will be here in the UK one day too. It could one day be as common as Buddleia and Himalayan Balsam
It was such a stunning sight though.
In fact since returning home I have noticed 2 in my neighbours garden, on speaking to him he stated that he didn't plant them and has no idea how they got there. Both have reached 6 feet tall in a single season, so I suspect you might well be correct.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Stems provides a good winter green. Fruits taste of caramel with seed being spread by birds or anything else that eat the berries.
Lat/Lng: 52.0, -4.8
OS grid ref: SN1045