2-oxoglutarate (OG)- and Fe(II)-dependent dioxygenase (2OGD) involved in scopoletin biosynthesis (PubMed:18547395, PubMed:29581584). 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 (PubMed:18547395). Required for the production and secretion of compounds (e.g. fluorescent coumarins) that facilitate the mobilization and uptake of iron from sources with low bioavailability or in high pH-induced iron deficiency conditions (PubMed:23735511, PubMed:24246380). Involved in the pathway of sideretin biosynthesis from feruloyl CoA, a redox-active catecholic metabolite exuded by roots in response to iron deficiency in order to facilitate the uptake of iron; this pathway consists in the successive conversion from feruloyl CoA to scopoletin, from scopoletin to fraxetin and from fraxetin to sideretin (PubMed:29581584). Catalyzes the biosynthesis of scopoletin from feruloyl CoA (PubMed:29581584). (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 11 sec(-1) with feruloyl CoA as substrate. Optimum pH is 6.5. Phenylpropanoid metabolism. Highly expressed in roots, especially in the cortex. Up-regulated by 2,4-D treatment (PubMed:18547395). Induced by iron deficiency, mainly in roots (PubMed:24246380, PubMed:23735511). No visible phenotype, but severe reductions in scopoletin and scopolin levels in the roots (PubMed:18547395, PubMed:29581584). Compromised iron uptake from an iron source of low bioavailability; this phenotype is partially rescued when grown alongside wild-type seedlings, presumably by secreted phenolics and flavins (PubMed:23735511). Loss of fluorescent coumarins (including sideretin, scopolin, scopoletin, esculin, esculetin, and fraxetin) root secretion in response to iron deficiency. Impaired iron-uptake ability at elevated pH (e.g. pH 7.2) leading to chlorotic and stunted plants; this phenotype is rescued by fraxetin, scopoletin, esculin, esculetin and sideretin treatments (PubMed:29581584, PubMed:24246380). Belongs to the iron/ascorbate-dependent oxidoreductase family.