Buddleja Davidii (commonly called Buddleia) grows wild along our river. It is "under surveillance" as a "weed of concern" in this country because of it's ability to grow and dominate in a wide range of areas and soils.
Also known as butterfly bush, summer lilac or orange eye it has a beautiful scent and long cone shaped clusters of flowers
It is native to China and Japan and I can see why it was bought here to grow and perfume our gardens. Unfortunately it has escaped the confines of the garden and is taking over areas previously left to the native plants.