The invention relates to a method of solubilizing a plant growth regulating agent, and method comprising contacting said agricultural active with a solubilizing effective amount of at least one solubilizing agent, wherein said solubilizing agent comprises at least one alkyl quaternary ammonium surfactant, or at least one alkoxylated quaternary ammonium surfactant, or a mixture thereof. Plant growth regulating formulations are also claimed.
