Irrigation in viticulture (the science of growing grapes) is when people water their grapevines with water from a hose or a pipe. This helps the grapes to grow healthy, juicy grapes. When the grapes have enough water, they will start to grow bigger, become ripe and sweet, and eventually turn into delicious grapes to eat or make wine out of! You can use irrigation in your vineyard to make sure that your grapes have enough water to stay healthy and grow correctly.