Worm wood essential oil is extracted by steam distillation method from the leaves and twigs of a perennial herb. This herb grows up to a height of 1.5 meters or 5 feet. It has a whitish stem and silvery-green divided leaves.The leaves are covered with silky, fine hairs and bear pale yellow flower. Wormwood (Artemisia scoparia)/ is often confused with a similar herb, Absinthe (Artemisia absinthium).