You'll love them! Here it's a butterfly magnet by August. Have fun taking photos and remember to add the photos of each Butterfly Bush to the database and get acorns as a bonus!
You can put annuals or potted plants around the bottoms for a more lush look, if you wish. Coleus would be one good choice though there are many plants available to hide the bare bottoms. Here's the entry for Honeycomb and even the photo taken at the Botanical Gardens shows the bottom is bare - no problem at all.
Butterfly Bush (Buddleja 'Honeycomb')