CAMPANULA PERSICIFOLIA 'TAKION '

I have never had great success with Campanulas overwintering and coming back the next spring in my garden but I keep on trying.  This year I have bought the Campanula 'Takion' white as well as the Blue version. Campanula persicifolia 'Takion' forms a clump with tall flower stems making it suitable for the front of a border. It prefers moist but well drained soil. At H7 classification, it is as hardy as hardy can get, apparently.  I wonder how I managed to kill off previous campanulas. Perhaps the dreaded vine weevil got them before I managed to rid my garden of the plant destroying critters.  

Campanula persicifolia 'Takion' Blue

According to the RHS Campanula persicifolia 'Takion' series are not picky.  They are hardy perennials that will tolerate any aspect except total shade, soil type, and they even say it is okay when sheltered or exposed.  Hmm, I'm not too sure about exposed where I live, at 850ft above sea level on the Pennine Mountains of West Yorkshire but my garden is surrounded by shadow-fencing and to some degree by other properties. 

Campanula persicifolia 'Takion' white

Campanula persicifolia 'Takion' white