Hyssopus officinalis is an attractive bushy, aromatic perennial herb that grows to about 2 ft. It has narrow leaves and either blue, pink, or white flowers. The leaves and flowering tops are collected twice a year: at the end of Spring, and at the beginning of Autumn. Hyssop Essential Oil is steam distilled from the leaves and flowering tops of the plant. The oil is pale-yellow to almost colorless. It has a powerful, sharp, sweet-camphoraceous odor with a warm, spicy undertone.