Pruning hydrangeas yearly is crucial for maintaining their beauty and optimal growth. According to award-winning designer Lee Burkhill, pruning stimulates new shoots and enhances flower displays, directing energy to fewer blooms for larger, more vibrant results. The best pruning time depends on the hydrangea type: those blooming on old wood should be pruned in late summer, while those blooming on new wood should be pruned in late winter to early spring.