Prohexadione calcium is widely used in agriculture as a plant growth regulator. It is primarily applied to control excessive vegetative growth in various crops, promoting more compact and sturdy plants. This chemical works by inhibiting gibberellin biosynthesis, which helps in reducing internode elongation and improving the overall structure of the plant. It is particularly effective in managing the height of cereal crops like wheat and barley, enhancing their resistance to lodging. Additionally, it is used in fruit trees, such as apples and pears, to improve fruit quality and yield by optimizing the balance between vegetative growth and fruit production. Its application also aids in stress tolerance and better resource utilization in plants.