Tom Atkinson wrote:

My buddleia is in full flower BUT NO butterflies. Anyone else have this
experience ?
Tom Atkinson

Butterflies definitely have preferences. We have ~15 buddleia bushes in
the garden, of various colours. They almost never touch the white
buddleia, similarly a very dark one. Even among the more 'standard'
colours, the butterflies are still picky.
--
Larry Stoter