What is a plant growth regulator used for?

A plant growth regulator is specifically used to regulate or alter the normal growth of plants. These substances can affect various growth processes, including stem elongation, leaf expansion, flower development, and the overall maturation of the plant. By using plant growth regulators, applicators can control unwanted growth patterns or encourage certain desired traits, such as compactness, flowering time, or even fruit production.

This targeted application makes growth regulators a valuable tool in both agricultural and horticultural practices, as it allows for the management of plant growth in a way that can improve crop yields or enhance the appearance and health of ornamental plants. The other options provided, such as promoting weed growth, killing plant life, or enhancing soil nutrients, do not accurately describe the function or purpose of plant growth regulators.