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The Nature of Plant essences
Essential oils may be found in different parts of the plant: in the petals (rose), leaves (eucalyptus), roots of grass (vetiver), bark (cinnamon), heartwood (sandalwood), citrus rind (lemon), seeds (caraway), rhizomes (valerian), bulbs (garlic), the aerial or toPparts of the plant (marjoram) or resin (frankincense), and sometimes in more than one part of the plant. Lavender, for instance, yields oil from both the flowers and the leaves, while the orange tree produces three different smelling essences with varying medicinal properties; the heady bitter-sweet neroli (flowers), the similar though less refined scent of petitgrain (leaves) and the cheery orange (rind of the fruit).
Although sometimes denigrated as 'waste products' of plant metabolism, studies have shown that plants utilize essential oils for such purposes as attracting pollinating insects, repelling predators and protecting themselves from disease - quite a significant survival mechanism. Yet essential oils are not vital to the life of plants as a whole, as the word 'essential' may suggest. Indeed, while it is true that most plants have an odor to a sensitive nose, not all plants produce volatile oils.
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