How to Prune commonName:"begonia 'Black Raspberry'"?
No pruning required

commonName:"begonia 'Black Raspberry'" · Begonia 'Black Raspberry'
Grow in light, well-drained, loam-based or loam-less, acid to neutral potting compost. Place in filtered light with shade from hot sun at an optimum of 15C to 22C, with high humidity. Will not tolerate continuous direct sunlight or waterlogging. Water moderately when in growth and apply a balanced liquid fertiliser at alternative waterings. See begonia cultivation - indoors for further information
No pruning required