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It looks horribly like buddleia. It doesnt have to be from the packet of seeds you sowed. If there is a bush anywhere in the vicinity, it is a real THUG, and will seed down like mad. If the container you sowed the packet in has been outside, it could have 'flown' in. You only have to go on a train journey these days, and see how it seeds down along the track.One for the bin in my book!!! (But definitely not compost bin!!!)valmarg