I have a lot of different campanula in my gardens. They are a multi-tasking "back bone" in many ways because they are tough little and large "boots" . I would find it hard to believe if most gardeners didn't have some form of them in their garden some where !
This "poscharskyana Blue Waterfall" is one of the sweetest little flowers I have .. and tenacious as all get out ! .. there is bare minimum "soil" in this niche of the driftwood that I have planted it in .. and out doing its third year there. It holds on for dear life and blooms its little heart out for me .. even when the rudbeckia competes, trying to get a leg over on it in this little space !
This area gets nice morning sun then light shade in the afternoon .. great for Heuchera, Tiarella, Heucherella .. Meadow Sweet or Filipendula "Elegans" , "Jack Frost Brunera" .. and this little Bleeding Heart .. along with Rudbeckia .. I may even squeeze a few more things in there .. one of my favorite spots in the garden !