Some people prune tomato plants and some just let them grow wild. So why might you want to prune your tomato plants? For larger tomatoes If you prune the plants more growth will go into the tomato and not vine production. When growing tomatoes vertical or in hanging baskets Plants can become heavy so when growing them vertical on a trellis, tomato cage or in a hanging basket you may want to prune them to lighten the plant and weight. Grandpa...