Clary Sage is a sturdy biennial herb that grows up to 3 feet tall, with small flower spikes rising above big hairy purple-green leaves. The essential oil is extracted from the leaves and flowering tops through steam distillation. Clary Sage has a wonderful sweet, nutty aroma and a dry flavor of dry wine. Clary Sage essential oil is recommended by aroma therapists to treat a variety of symptoms. Clary Sage essential oil contains high levels of an ester called linalyl acetate, a compound that is greatly known to balance the nervous system.