Tarragon, Artemesia dracunculus, was originally known as Estragon.  Therapeutically, tarragon relieves PMS, digestive complaints , anorexia and various urinary problems. It is not recommended for pregnant women  or nursing mothers. It has been used to eliminate parasites and reduce spasms. In perfumes, tarragon, with a sweet and spicy scent ,is a base aroma, holding down and extending the fragrance of a blend. It adds a hint of spice to a blend when dosed lightly. It blends well with Carrot seed, Galbanum, Wormwood, lime, Clary sage, Oakmoss  Patchouli, and Angelica root. I usually only use a drop or two in a blend.The scent takes the highly odorous Wormwood and Galbanum down a notch so neither will overwhelm a blend. Refrigerate after opening to keep the flavor fresh.