Goddess Sif - Hair made of Gold

One night, while Sif was asleep, with her husband, Thor, Loki snuck in and took all of Sif's hair. Thor was mad. To make amends Loki tricked some Dwarves into making Sif a new set of hair, this time made of actual gold (but it still grows and works like regular hair) . Sif is the goddess of growing things and farming, that's why she's the best at growing hair.