https://www.rhs.org.uk/plants/61010/campanula-persicifolia-grandiflora/details
Find help & information on Campanula persicifolia 'Grandiflora' from the RHS
campanula persicifoliagrandiflorarhs
https://www.rhs.org.uk/plants/52352/campanula-persicifolia-china-blue/details
Find help & information on Campanula persicifolia 'China Blue' from the RHS
campanula persicifoliachina bluerhs