I have two Caryopteris × clandonensis 'Dark Knight' and just love them! They sometimes even multiply by self-layering and I've given away a few starts that way. Thankfully, they do not do this enough to be considered invasive. They are one of the few late bloomers and I love the smell when I grab a stem and crush the leaves.

I bought the blue glory bower from a small nursery 15 miles from where I live. I just had to buy it! The blue butterflies are so cute! I recently cut them back and am rooting them - hopefully I will have extras to share.

The "mist flowered" forms of Caryopteris must have a more pleasant foliage fragrance than divaricata. I avoid touching it because it has such a pungent aroma. I'll have to look up Dark Knight.
I grew my Glory Bower from seed piksihk, but I'm thinking of taking cuttings and discarding the parent to save room this winter.

Yes, definitely do check it out. It has a nice fragrance, but I can't put my finger on exactly what it reminds me of.

I wish I could grow Glory Bower, but I am afraid it would not survive my zone 6b garden.