Grimm connects Eddic references to Sif's golden hair (gold is referred to as ; Sif's hair) with the herb name ("Polytrichum aureum"). Grimm says that "expositors see in this the golden fruits of the Earth burnt up by fire and growing again, they liken Sif to Ceres", and Grimm says that "with it agrees the fact that O. Slav. is a gloss on " but cites etymological problems between the potential cognate. Grimm says that Thor's mother was the earth, and not his wife, yet "we do find the simple "Sif" standing for earth." Grimm adds that he is inconclusive regarding Sif and that, "we ought to have fuller details about Sif, and these are wholly wanting in our mythology. Nowhere amongst us is the mystic relation of the seed-corn of Demeter, whose poignant grief for her daughter threatens to bring famine on mankind (Hymn to Cer. 305–306), nor anything like it, recorded."