Plants contain aromatics stored in the oil cells of their plant tissue. These volatile essential oils can be found in all parts of the plant, from roots (vetiver, iris), mosses and wood (sandal, stone pine), herbs (rosemary) and leaves (lemongrass, petit grain) to flowers (rose, neroli), seeds (musk grains), fruits (anise, fennel) and fruit peels (orange, bergamot). They are obtained by steam distillation, pressing (citrus oils) or extraction (flower oils).