[seszett]

I don't know about the US but in most of France and Belgium they are everywhere, they grow like weeds, including on badly maintained brickwork, they seem to be especially suited to urban areas.

All these other plants you mentioned do attract pollinators but they don't propagate as well, they are only where they have been planted at least around here. Even on the warmer Atlantic coast, rosemary and lavender grow well but they don't propagate nearly as much by themselves as butterfly bush (Buddleja) does.