And the award for the ugliest foliage goes to...
Oh my goodness the foliage of this plant is butt-ugly! I very much like the flowers, though - so I use the old hide the eyesore behind other plants trick. I saw a different variety with deeper, richer-colors flowers than Butterfly Blue and bought them yesterday, hid them behind some lamb's ears -- I'm enjoying the blooms rising up behind the lamb's eye but don't have to look at that mess of foliage.
This area is a little sparse at the moment, I'm waiting for the hibiscus and the butterfly bush and B&B salvia to fill in, but I do like the shot of purple here:
Close-up of the weedy foliage: