PLANTS, are chemical factories inhabiting the interface between light and dark, sun and earth, drawing energy from each and synthesizing this into molecules of carbohydrates, proteins and fats. Essential oils are extracted from certain varieties of trees, shrubs, herbs, grasses, roots, fruits, and flowers. The oil is concentrated in different parts of the plant. To exemplify, Vetiver oil is made from the roots of the grass species Vetiveria zizanoides; bay oil is extracted from the leaves of Laurus nobilis. Geranium oil comes from the plant’s leaves and stalks, cumin oil comes from the seeds, and ginger oil comes from the rhizomes, while rose oil comes from the fragrant petals of the rose flower. Myrrh, frankincense, and benzoin oils are extracted from the resin of their respective trees. Mandarin, lemon, lime, grapefruit, and bergamot oils are extracted from the peel of the fruits, and pine oil comes from the needles and twigs of pine trees, while sandalwood comes from the heartwood of the sandalwood tree. If one was to look at lavender under a microscope, you’d see the smooth round glands that contain the essential oil, surrounded by a forest of spiky nonsecretory trichomes. Many varieties of plants have similar sessile secretory glands that appear as round, distinct units with a cuticle, or outer membrane, protecting a package of secretory cells. In other species of plants, the essential oil–producing glands look like microscopic stalks. In seeds, the essential oil is stored in vittae, little pockets on the outer surface. In orange and lemon, oil cavities are found in the outer portion of the peel. In clove, a multitude ofendogenous oil glands lie just beneath the surface, while in frankincense, resin globules are released from oil ducts. In ginger, the essential oil is found in secretory cells of parenchyma tissue, while in cedarwood the secretory cells line resin ducts.