FAMILY: Pinaceae
SYNONYMS: Pinus canadensis, Abies canadensis, spruce, eastern hemlock, common hemlock, hemlock (oil), spruce (oil), fir needle (oil).
GENERAL DESCRIPTION: A large evergreen tree up to 50 metres tall, with slender horizontal branches, finely toothed leaves and smallish brown cones, which yields a natural exudation from its bark.
DISTRIBUTION: Native to the west coast of the USA. The oil is produced in Vermont, New York, New Hampshire, Virginia and Wisconsin.
OTHER SPECIES: Numerous cultivars of this species exist; often the oil is produced from a mixture of different types. Similar oils, also called simply ‘spruce oil’ are produced from the black spruce (Picea nigra or mariana), the Norway spruce (P. abies) and the white or Canadian spruce (P. glauca). The essential oil from the western hemlock (Tsuga heterophylla), contains quite different constituents. It is also closely related to the Douglas fir (Pseudotsuga taxifolia), which is also used to produce an essential oil and a balsam.
HERBAL/FOLK TRADITION: The bark of the hemlock spruce (which contains tannins and resin as well as volatile oil) is current in the British Herbal Pharmacopoeia indicated for diarrhoea, cystitis, mucous colitis, leucorrhoea, uterine prolapse, pharyngitis, stomatitis and gingivitis. An extract of the bark is also used in the tanning industry.
ACTIONS: Antimicrobial, antiseptic, antitussive, astringent, diaphoretic, diuretic, expectorant, nervine, rubefacient, tonic.
EXTRACTION: Essential oil by steam distillation from the needles and twigs.
CHARACTERISTICS: A colourless or pale yellow liquid with a pleasing, fresh-balsamic, sweet-fruity odour. It blends well with pine, oakmoss, cedarwood, galbanum, benzoin, lavender, lavandin and rosemary.
PRINCIPAL CONSTITUENTS: Mainly pinenes, limonene, bornyl acetate, tricyclene, phellandrene, myrcene, thujone, dipentene and cadinene, among others. Constituents vary according to source and exact botanical species (sometimes mixed).
SAFETY DATA: Non-toxic, non-irritant, non-sensitizing.
AROMATHERAPY/HOME: USE
Circulation muscles and joints: Muscular aches and pains, poor circulation, rheumatism.
Respiratory system: Asthma, bronchitis, coughs, respiratory weakness.
Immune system: Colds, ’flu, infections.
Nervous system: Anxiety, stress-related conditions – ‘opening and elevating through grounding ... excellent for yoga and meditation.’.
OTHER USES: Used in veterinary liniments. Extensively used for room spray perfumes, household detergents, soaps, bath preparations and toiletries, especially in the USA.
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