2-oxoglutarate (OG)- and Fe(II)-dependent dioxygenase (2OGD)involved in scopoletin biosynthesis. Converts feruloyl CoA into 6'-hydroxyferuloyl CoA but has no activity with ferulic acid, feruloylquinic acid, caffeic acid, caffeoyl CoA, p-coumaric acid, cinnamic acid, cinnamoyl CoA or benzoyl CoA. (E)-feruloyl-CoA + 2-oxoglutarate + O2 = (E)-6-hydroxyferuloyl-CoA + CO2 + succinate (E)-6-hydroxyferuloyl-CoA = CoA + scopoletin Binds 1 Fe(2+) ion per subunit. kcat is 4.79 sec(-1) with feruloyl CoA as substrate. Optimum pH is 6.5. Low expression in roots. Not induced by 2,4-D treatment. No effect on scopoletin and scopolin levels in the roots. Belongs to the iron/ascorbate-dependent oxidoreductase family.