Catalyzes the 2-beta-hydroxylation of several biologically active gibberellins, leading to the homeostatic regulation of their endogenous level. Catabolism of gibberellins (GAs) plays a central role in plant development (PubMed:12736788, PubMed:18952778). In vitro, converts GA1, GA20, and GA29 to the corresponding 2-beta-hydroxylated products GA8, GA29-catabolite, respectively (PubMed:12736788). 2-oxoglutarate + gibberellin A1 + O2 = CO2 + gibberellin A8 + succinate Binds 1 Fe(2+) ion per subunit. Expressed in roots, shoot apex, leaf blades, leaf sheaths, stems and flowers. Induced by gibberellin. Plants overexpressing GA2OX3 exhibit extremely dwarf phenotype and are unable to achieve phase transition from vegetative to reproductive growth. Belongs to the iron/ascorbate-dependent oxidoreductase family. GA2OX subfamily.