Gibberellin A4 is a plant hormone originally isolated from G. fujikuroi that has plant signaling and growth stimulatory activities.¹ Gibberellin A4 is found in the micropylar endothelium cells of Arabidopsis maternal seed tissue and triggers suspensor programmed cell death (PCD) in the embryo.² It increases hypocotyl, but not radicle, growth of cucumber seedlings when used at concentrations ranging from 6-100 µM.³ Gibberellin A4 also increases flowering in apple trees when applied post-flowering in the previous year.⁴