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. Converts GA9/GA20 to GA51/GA29 and GA4/GA1 to GA34/GA8. 2-oxoglutarate + gibberellin A1 + O2 = CO2 + gibberellin A8 + succinate Binds 1 Fe(2+) ion per subunit. Plant hormone biosynthesis; gibberellin biosynthesis. Expressed at the base of the shoot apical meristem and developing leaf primordia. Not regulated by auxin. Down-regulated by paclobutrazol. Belongs to the iron/ascorbate-dependent oxidoreductase family. GA2OX subfamily.