How to Prune rex begonia 'Salsa'?
No pruning required

rex begonia 'Salsa' · Begonia 'Salsa'
Grow as a houseplant in a minimum temperature of 10°C. Prefers part shade, or bright shade, but no direct sunlight. Keeps its foliage in warm temperatures. For more advice, see Begonias: houseplants
No pruning required