What practice is essential for shaping grapevines during growth?

The essential practice for shaping grapevines during their growth is training. Training involves guiding the growth of grapevines along a predetermined structure or system, such as trellises or stakes. This is crucial because it influences how the vine will develop, potentially increasing air circulation and sunlight exposure, which can enhance grape quality and yield.

Training allows vineyard managers to establish a desired vine architecture, which can promote better fruit development and makes the management of the vines more efficient throughout the growing season. It encourages the right balance of foliage and fruit, which is vital for optimal ripening and quality of the grapes.

While pruning is also important, particularly for maintaining the health and productivity of the vines, its main focus is on cutting back growth to encourage new growth and manage yield, rather than shaping the vine itself. Fertilizing and irrigation, on the other hand, support vine health and growth but do not directly involve shaping the plant.