Celery has a very long growing season (at least 15 months) and has a low tolerance for heat, cold and drought. Since it is a biennial plant, meaning it won't flower until the second year, it is planted early in spring and harvested in early summer of the following year.

Before harvesting, the plants are allowed to flower and go to seed. The seeds dry and turn a greyish-tan colour when they are ready to harvest. The dried seeds can fall off the plant with the slightest breeze, so they require vigilant monitoring to ensure they are harvested at just the right moment.

After harvesting, the seeds are crushed and steam distilled to produce doTERRA Celery essential oil.