Catalyzes the 3'5'-hydroxylation of naringenin and eriodictyol to form 5,7,3,'4',5'-pentahydroxyflavanone and 3',5'-hydroxylation of dihydrokaempferol and dihydroquercetin to form dihydromyricetin. a 3',5'-unsubstituted flavanone + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = a 3',5'-dihydroxyflavanone + 2 H(+) + 2 H2O + 2 oxidized [NADPH--hemoprotein reductase] Pigment biosynthesis; anthocyanin biosynthesis. Hypocotyl tissues. Most abundant during the mid stage of flower bud development but not detected in leaf tissues. By white light. Belongs to the cytochrome P450 family.