How to Prune trailing watermelon begonia?
Shorten shoots, when in growth, to maintain shape

trailing watermelon begonia · Elatostema repens
Also known as: watermelon begonia
Under glass grow in loam-based potting compost in bright, indirect light and shade from hot sun. Water freely and apply a balanced liquid fertiliser monthly when in growth and water moderately in winter. Can be grown outdoors in fertile, humus-rich soil in deep shade
Shorten shoots, when in growth, to maintain shape