Antimicrobial plants
Plants can be antiseptic, disinfectant, antibiotic, antibacterial, antimycotic or antiviral. These properties are going to be described at each plant species consideration.
Fir, Silver fir (Abies alba, pectinata)
The buds are antibiotic, antiseptic and balsamic. The bark is antiseptic and astringent. It can be harvested as required throughout the year. The leaves are expectorant and a bronchial sedative. They are best harvested in the spring and can be dried for later use. The resin is antiseptic, balsamic, diuretic, eupeptic, expectorant, vasoconstrictor and vulnerary. Both the leaves and the resin are common ingredients in remedies for colds and coughs, either taken internally or used as an inhalant.
The leaves and/or the resin are used in folk medicine to treat bronchitis, cystitis, leucorrhoea, ulcers and flatulent colic. The resin is also used externally in bath extracts, rubbing oils etc for treating rheumatic pains and neuralgia. Oil of Turpentine, which is obtained from the trunk of the tree, is occasionally used instead of the leaves or the resin. The oil is also rubefacient and can be applied externally in the treatment of neuralgia.
Garlic (allium sativum)
Garlic has a very long folk history of use in a wide range of ailments, particularly ailments such as ringworm, Candida and vaginitis where its fungicidal, antiseptic, tonic and parasiticidal properties have proved of benefit. The plant produces inhibitory effects on gram-negative germs of the typhoid-paratyphoid-enteritis group, indeed it possesses outstanding germicidal properties and can keep amoebic dysentery at bay. It is also said to have anticancer activity. It has also been shown that garlic aids detoxification of chronic lead poisoning.
Daily use of garlic in the diet has been shown to have a very beneficial effect on the body, especially the blood system and the heart. For example, demographic studies suggest that garlic is responsible for the low incidence of arteriosclerosis in areas of Italy and Spain where consumption of the bulb is heavy. Recent research has also indicated that garlic reduces glucose metabolism in diabetics, slows the development of arteriosclerosis and lowers the risk of further heart attacks in myocardial infarct patients.
Externally, the expressed juice is an excellent antiseptic for treating wounds. The fresh bulb is much more effective medicinally than stored bulbs, extended storage greatly reduces the anti-bacterial action. The bulb is said to be anthelmintic, antiasthmatic, anticholesterolemic, antiseptic, antispasmodic, cholagogue, diaphoretic, diuretic, expectorant, febrifuge, stimulant, stings, stomachic, tonic, vasodilator.
Greater celandine (Chelidonium majus) has a long history of herbal use. Traditionally it was employed as an ophthalmic to treat and clear the eyesight whilst in modern herbal medicine it is used more as a mild sedative, antispasmodic and detoxifying herb, relaxing the muscles of the bronchial tubes, intestines and other organs. The latex is much used externally to treat warts. Caution should be employed, especially when the plant is used internally however, because it contains toxic alkaloids.
The leaves and the sap are acrid, alterative, anodyne, antispasmodic, caustic, cholagogue, diaphoretic, diuretic, hydrogogue, narcotic, purgative. They are used in the treatment of bronchitis, whooping cough, asthma, jaundice, gallstones and gallbladder pains. The plant is harvested in the spring as it comes into flower, it is best used fresh, but can also be dried for later use. The roots can also be used, these are harvested in the autumn and dried for later use. The plant has anticancer properties and is analgesic. It is an important component of a stomach ulcer drug. The plant has an abundant acrid bright-orange sap that stains the skin strongly and is powerfully irritant.
It is used as an external treatment to get rid of warts, ringworm and corns and has also been used to remove films from the cornea of the eye. The plant contains the alkaloid chelidonine, which is similar to the alkaloid papaverine found in poppies. This alkaloid has antispasmodic and sedative effects on the bile ducts and bronchi. However, results have been inconsistent, especially if the preparation is not fresh. The plant also contains the alkaloid sparteine, which restores normal rhythm to feeble arrhythmic myocardia.
Iceland moss (Cetraria islandica) has been used since ancient times as a cough remedy and has also been used in European folk medicine as a cancer treatment. In present day herbalism it is highly prized for its strongly antibiotic and demulcent actions, being used especially to soothe the mucous membranes of the chest, to counter catarrh and calm dry and paroxysmal coughs – it is particularly helpful as a treatment for elderly people.
Iceland moss has both a demulcent and a bitter tonic effect within the gut – a combination almost unique amongst medicinal herbs. The whole plant is strongly antibiotic, antiemetic, strongly demulcent, galactogogue, nutritive and tonic.
It is excellent when used internally in the treatment of chronic pulmonary problems, catarrh, dysentery, chronic digestive disturbances (including irritable bowel syndrome and food poisoning) and advanced tuberculosis. Externally, it is used in the treatment of boils, vaginal discharges and impetigo. The plant can be harvested as required throughout the year, preferably during dry weather, and can also be dried for later use. Use with caution.
Lemon balm (Melissa officinalis) is a commonly grown household remedy with a long tradition as a tonic remedy that raises the spirits and lifts the heart. Modern research has shown that it can help significantly in the treatment of cold sores. The leaves and young flowering shoots are antibacterial, antispasmodic, antiviral, carminative, diaphoretic, digestive, emmenagogue, febrifuge, sedative, and tonic. It also acts to inhibit thyroid activity. An infusion of the leaves is used in the treatment of fevers and colds, indigestion associated with nervous tension, excitability and digestive upsets in children, hyperthyroidism, depression, mild insomnia, headaches etc.
Externally, it is used to treat herpes, sores, gout, insect bites and as an insect repellent. The plant can be used fresh or dried, for drying it is harvested just before or just after flowering. The essential oil contains citral and citronella, which act to calm the central nervous system and are strongly antispasmodic. The plant also contains polyphenols, in particular these combat the herpes simplex virus which produces cold sores. The essential oil is used in aromatherapy.
Myrtle (Myrthus communis)
The leaves are aromatic, balsamic, haemostatic and tonic. Recent research has revealed a substance in the plant, the myrtol, that has an antibiotic action. The active ingredients in myrtle are rapidly absorbed and give a violet-like scent to the urine within 15 minutes.
The plant is taken internally in the treatment of urinary infections, digestive problems, vaginal discharge, bronchial congestion, sinusitis and dry coughs. In India it is considered to be useful in the treatment of cerebral affections, especially epilepsy.
Externally, it is used in the treatment of acne (the essential oil is normally used here), wounds, gum infections and haemorrhoids. The leaves are picked as required and used fresh or dried. An essential oil obtained from the plant is antiseptic. It contains the substance myrtol – this is used as a remedy for gingivitis. The oil is used as a local application in the treatment of rheumatism. The fruit is carminative. It is used in the treatment of dysentery, diarrhoea, haemorrhoids, internal ulceration and rheumatism
Oregano (Origanum vulgare) has been used as a culinary and medicinal herb for thousands of years. It has a beneficial effect upon the digestive and respiratory systems and is also used to promote menstruation. It should not be used medicinally by pregnant women though it is perfectly safe in small amounts for culinary purposes.
The leaves and flowering stems are strongly antiseptic, antispasmodic, carminative, cholagogue, diaphoretic, emmenagogue, expectorant, stimulant, stomachic and mildly tonic.
The plant is taken internally in the treatment of colds, influenza, mild feverish illnesses, indigestion, stomach upsets and painful menstruation. It is strongly sedative and should not be taken in large doses, though mild teas have a soothing effect and aid restful sleep. It should not be prescribed for pregnant women.
Externally, oregano is used to treat bronchitis, asthma, arthritis and muscular pain. The plant can be used fresh or dried – harvest the whole plant (but not the roots) in late summer to dry and store for winter use. Oregano is often used in the form of an essential oil that is distilled from the flowering plant. A few drops of the essential oil, put on cotton wool and placed in the hollow of an aching tooth, frequently relieves the pain of toothache.
This plant is one of the best natural antiseptics because of its high thymol content. The essential oil is used in aromatherapy to treat the same kinds of complaints that the herb is used for.
Rosemary (Rosmarinus officinalis) is commonly grown in the herb garden as a domestic remedy, used especially as a tonic and pick-me-up when feeling depressed, mentally tired, nervous etc. Research has shown that the plant is rich in volatile oils, flavanoids and phenolic acids, which are strongly antiseptic and anti-inflammatory. Rosmarinic acid has potential in the treatment of toxic shock syndrome, whilst the flavonoid diosmin is reputedly more effective than rutin in reducing capillary fragility. Rosmarol, an extract from the leaves, has shown remarkably high antioxidant activity. The whole plant is antiseptic, antispasmodic, aromatic, astringent, cardiac, carminative, cholagogue, diaphoretic, emmenagogue, nervine, stimulant, stomachic and tonic.
An infusion of the flowering stems made in a closed container to prevent the steam from escaping is effective in treating headaches, colic, colds and nervous diseases. A distilled water from the flowers is used as an eyewash. The leaves can be harvested in the spring or summer and used fresh, they can also be dried for later use.
This remedy should not be prescribed for pregnant women since in excess it can cause an abortion. An essential oil distilled from the stems and leaves is often used medicinally, that distilled from the flowering tops is superior but not often available. The oil is applied externally as a rubefacient, added to liniments, rubbed into the temples to treat headaches and used internally as a stomachic and nervine. The essential oil is used in aromatherapy
Sage (Salvia officinalis) has a very long history of effective medicinal use and is an important domestic herbal remedy for disorders of the digestive system. Its antiseptic qualities make it an effective gargle for the mouth where it can heal sore throats, ulcers etc.
The leaves applied to an aching tooth will often relieve the pain. The whole herb is antihydrotic, antiseptic, antispasmodic, astringent, carminative, cholagogue, galactofuge, stimulant, tonic and vasodilator. Sage is also used internally in the treatment of excessive lactation, night sweats, excessive salivation (as in Parkinson’s disease), profuse perspiration (as in TB), anxiety, depression, female sterility and menopausal problems. Many herbalists believe that the purple-leafed forms of this species are more potent medicinally. This remedy should not be prescribed to pregnant women or to people who have epileptic fits[238]. The plant is toxic in excess or when taken for extended periods – though the toxic dose is very large.
Externally, it is used to treat insect bites, skin, throat, mouth and gum infections and vaginal discharge. The leaves are best harvested before the plant comes into flower and are dried for later use. The essential oil from the plant is used in small doses to remove heavy collections of mucous from the respiratory organs and mixed in embrocations for treating rheumatism. In larger doses, however, it can cause epileptic fits, giddiness etc.
Tasmanian Blue Gum (Eucalyptus globulus) Eucalyptus leaves are a traditional Aboriginal herbal remedy. The essential oil found in the leaves is a powerful antiseptic and is used all over the world for relieving coughs and colds, sore throats and other infections. The essential oil is a common ingredient in many over-the-counter cold remedies. The adult leaves, without their petioles, are antiperiodic, antiseptic, aromatic, deodorant, expectorant, febrifuge, hypoglycaemic and stimulant]. The leaves, and the essential oil they contain, are antiseptic, antispasmodic, expectorant, febrifuge and stimulant. Extracts of the leaves have antibacterial activity. The essential oil obtained from various species of eucalyptus is a very powerful antiseptic, especially when it is old, because ozone is formed in it on exposure to air. It has a decided disinfectant action, destroying the lower forms of life. The oil can be used externally, applied to cuts, skin infections etc, it can also be inhaled for treating blocked nasal passages, it can be gargled for sore throat and can also be taken internally for a wide range of complaints. Some caution is advised, however, because like all essential oils, it can have a deleterious effect on the body in larger doses. The oil from this species has a somewhat disagreeable odour and so it is no longer used so frequently for medicinal purposes, other members of the genus being used instead. An oleo- resin is exuded from the tree. It can also be obtained from the tree by making incisions in the trunk. This resin contains tannin and is powerfully astringent, it is used internally in the treatment of diarrhoea and bladder inflammation, externally it is applied to cuts etc. The essential oil is used in aromatherapy.
Common thyme (Thymus vulgaris) has a very long history of folk use for a wide range of ailments. It is very rich in essential oils and these are the active ingredients responsible for most of the medicinal properties. In particular, thyme is valued for its antiseptic and antioxidant properties, it is an excellent tonic and is used in treating respiratory diseases and a variety of other ailments. The flowering tops are anthelmintic, strongly antiseptic, antispasmodic, carminative, deodorant, diaphoretic, disinfectant, expectorant, sedative and tonic. The plant is used internally in the treatment of dry coughs, whooping cough, bronchitis, bronchial catarrh, asthma, laryngitis, indigestion, gastritis and diarrhoea and enuresis in children. It should not be prescribed for pregnant women. Externally, it is used in the treatment of tonsillitis, gum diseases, rheumatism, arthritis and fungal infections. The plant can be used fresh at any time of the year, or it can be harvested as it comes into flower and either be distilled for the oil or dried for later use. Thyme has an antioxidant effect, thus regular use of this herb improves the health and longevity of individual body cells and therefore prolongs the life of the body. The essential oil is strongly antiseptic. The whole herb is used in the treatment of digestive disorders, sore throats, fevers etc. The essential oil is one of the most important oils used in aromatherapy.It is used especially in cases of exhaustion, depression, upper respiratory tract infections, skin and scalp complaints etc. The oil can cause allergic reactions and irritation to the skin and mucous membranes.
Yarrow (Achillea millefolium) a perennial flowering plant that is related to chamomile has been highly prized by traditional healers for centuries for its wide range of medicinal properties, particularly with regards to its antiseptic and anti-inflammatory actions.
Yarrow has a high reputation and is widely employed in herbal medicine, administered both internally and externally. It is used in the treatment of a very wide range of disorders but is particularly valuable for treating wounds, stopping the flow of blood, treating colds, fevers, kidney diseases, menstrual pain etc. The whole plant is used, both fresh and dried, and is best harvested when in flower. Some caution should be exercised in the use of this herb since large or frequent doses taken over a long period may be potentially harmful, causing allergic rashes and making the skin more sensitive to sunlight. The herb combines well with Sambucus nigra flowers (Elder) and Mentha x piperita vulgaris (Peppermint) for treating colds and influenza[268]. The herb is antiseptic, antispasmodic, mildly aromatic, astringent, carminative, cholagogue, diaphoretic, digestive, emmenagogue, odontalgic, stimulant, bitter tonic, vasodilator and vulnerary. It also contains the anti-inflammatory agent azulene, though the content of this varies even between plants in the same habitat. The fresh leaf can be applied direct to an aching tooth in order to relieve the pain.
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