3-Indoleacetonitrile is primarily used in the field of plant biology and agriculture as a growth regulator. It plays a significant role in promoting plant growth and development by influencing cell elongation and division. This compound is particularly effective in enhancing root formation in various plant species, making it valuable for horticulture and crop production. Additionally, it is utilized in research to study the biosynthesis and physiological effects of auxins, a class of plant hormones. Its application extends to tissue culture techniques, where it aids in the propagation of plants under controlled conditions. Overall, 3-Indoleacetonitrile is a crucial tool in improving plant health and productivity.