Next best after Buddleja as a butterfly attractant in my garden and complementing it as it comes into flower just as Buddleja is finished: Eupatorium cannabinum (hemp agrimony / hjortetrøst)..
Insects on Hemp Agrimony
Edible & ornamental
I have 1 beside my pond. It grows up to about 6 feet then flops over. It’s been covered in all sorts of insects all summer