Gibberellic Acid, also called Gibberellin A3, is a plant hormone in the family of gibberellins, a large class of naturally ocuring tetracyclic diterpene acids which promote cell growth and development. In small concentrations, GA3 is a potent, dihydroxylated gibberellin which commonly used in the triggering of seed germination, stem differentiation and plant maturation.GA3 is widely used to promote the production of larger grape bunches or the induction of other fruit without pollination or seed development. Gibberellic Acid 3 is a growth regulator.