Include one or many fragrant oils, like eucalyptus oil, grapefruit oil, etc., also called solvent extractions. There are 'absolutes' that are essence oils extracted from flowers and delicate plant tissues. They also include the essences of fragrant butters and enfleurage pommades. There are 'phytoncides' or voltile organic compounds that kill microbes. Among these, 'allium' is not desirable due to its disagreeable odors. You can include hydrosols; the aqueous by products.
Aromatherapy can be traced back to the ancient Egyptians who extracted oils and essences from plants and used them for trade. Today oils are used not only for their physical effects but are also linked with other therapies to facilitate holistic health. These gifts cover a range of ideas for those who like to use oils for their own health as well as the practitioner – something for everyone at every level.