Gibberellin-Induced Flowering in Cordyline (Agavaceae)

Normal, terminal inflorescences of Cordyline terminalis, a woodymonocotyledon, appeared 4–6 weeks after apical buds weretreated with gibberellin A₃ (GA₃) or GA₄₊₇. There was no responseto GA₁₃. Large plants, newly rooted cuttings, and seedlingsall responded, although there were clonal differences. Floweringwas induced under natural day lengths throughout the year. Untreatedcontrol plants in all experiments remained vegetative. Dracaenaspp. did not respond to the three gibberellins.