Of all the ferulas, ferula gummosa is prized for its intense, green parsley-scented root resin - galbanum. After three years growing in the foothills of the Alborz in Northern Iran, wild Ffern ferula roots are hand-scored with a traditional wrought iron galbanum tool. The score fills with resin over a three day period, dries, and only then is harvested. Each plant will produce galbanum for another four years before the resin yield falls to zero.