Gibberellins (GAs) are plant hormones that regulate various developmental processes, including stem elongation, germination, dormancy, flowering, flower development, and leaf and fruit senescence. GAs are one of the longest-known classes of plant hormone. Three classes of GA-biosynthesis inhibitors that affect different steps in the pathway are known.

Prohexadione-Ca is a plant bioregulator that is primarily used to inhibit excessive vegetative growth in fruit trees and other crop plants. Additionally, effects on the incidence of bacterial and fungal diseases and on insect pests are often observed. Furthermore, the compound may reduce abortion of fruitlets, thereby increasing fruit set. Prohexadione-Ca is relatively short-lived and possesses very favorable toxicological and ecotoxicological features.