How to Fertilize Campanula carpatica 'Rapido White'?
Diluted general flower feed every three weeks active growth

Campanula carpatica 'Rapido White' · Campanula carpatica 'Rapido White'
Will grow well in well-drained soil preferably in full sun to partial shade. Avoid wet winter conditions, adding a mineral mulch to the soil surface can be beneficial.
Diluted general flower feed every three weeks active growth