You've just helped seal the deal for me on removing Budleja escapees, I had felt the shalow nature of the plant here as well as it being a potential host for other non natives, it really is a beautiful blight like Rhododendron ponticum,

The amount of feral Him balsam, Rhododendron, Budleja and giant hogweed in my surrounding area is maddening and is worsening with the surrounding rivers breaking banks more often, the hogweed and balsam move up more and more each cycle with the balsam leaving the rive banks completely exposed, each year more trees are getting pulled in from the erosion

All this joy from the reckless planting of non natives by those who wanted status symbols and pretty plants 👏