Catalyzes the 3-beta-hydroxylation of the inactive gibberellin precursors, leading to the formation of bioactive gibberellins. In vitro, converts the precursors GA20, GA5, GA44 and GA9 to the corresponding 3-beta-hydroxylated bioactive products GA1, GA3, GA38 and GA4, respectively. Involved in the production of bioactive GA for vegetative growth and development. May possess 2,3-desaturase activity, catalyzing the conversion of GA9 to 2,3-dehydro-GA9, and GA20 to GA5 (2,3-dehydro GA20). May possess 2-beta-hydroxylase activity, catalyzing the conversion of GA1 and GA4 to the corresponding 2-beta-hydroxylated products GA8 and GA34, respectively. 2-oxoglutarate + gibberellin A20 + O2 = CO2 + gibberellin A1 + succinate Binds 1 Fe(2+) ion per subunit. Plant hormone biosynthesis; gibberellin biosynthesis. Expressed in unopened flowers. During anther development, expressed in the tapetum at the middle-stage and late-stage of pollen differentiation. Belongs to the iron/ascorbate-dependent oxidoreductase family. Truncated N-terminus.