You can prune this begonia in the spring or throughout the year, as long as there are dead or damaged leaves or stems. Either way, you'll be rewarded with a beautiful, healthy plant! Here's how to prune: Use a sharp pruning tool such as scissors or a knife and sterilize it with alcohol. Then, pinch back new growth to encourage dense growth, pinch the tips of new shoots, and prune dead or damaged growth. You can immediately shape your plant to be pleasing to the eye!