Hyssopus officinalis or hyssop is a(n) herbaceous plant of the genus Hyssopus native to Southern Europe, the Middle East, and the region surrounding the Caspian Sea. Due to its properties as an antiseptic, cough reliever, and expectorant, it is commonly used as a medicinal plant.
Hyssop is a brightly coloured shrub or subshrub that ranges from 30 to 60 cm (12 to 24 in) in height. The stem is woody at the base, from which grow a number of straight branches. Its leaves are lanceolate, dark green in colour, and from 2 to 2.5 cm (0.79 to 0.98 in) long.
A plant called hyssop has been in use since classical antiquity. Its name is a direct adaptation from the Greek ὕσσωπος (hyssopos). The Hebrew word אזוב (ezov, esov, or esob) and the Greek word ὕσσωπος probably share a common (but unknown) origin. The name hyssop appears as a translation of ezov in some translations of the Bible, notably in verse 7 of Psalm 51: "Thou shalt purge me with hyssop, and I shall be clean" (King James Bible), but researchers have suggested that the Biblical accounts refer not to the plant currently known as hyssop but rather to one of a number of different herbs, including Origanum syriacum (Syrian oregano, commonly referred to as "bible hyssop"). I Kings iv. 33 mentions that 'ezov' was a small plant. It was burned with the Red Heifer (Num. xix. 6) and used for purification of lepers (Lev. xiv. 4, 6, 49, 51; comp. Num. xix. 18; Ps. li. 9), and at Passover it was used to sprinkle the blood of the sacrificial lamb on the doorposts(Ex. xii. 22).
Hyssop was also used for purgation (religious purification) in Egypt, where, according to Chaeremon the Stoic, the priests used to eat it with bread in order to purify this type of food and make it suitable for their austere diet.
The species as a whole is resistant to drought, and tolerant of chalky, sandy soils. It thrives in full sun and warm climates.
Cultivars include 'Blue Flower'.
Under optimal weather conditions, herb hyssop is harvested twice yearly, once at the end of spring and once more at the beginning of the fall. The plants are preferably harvested when flowering in order to collect the flowering tips.
Once the stalks are cut, they are collected and dried either stacked on pallets to allow for draining or hung to dry. The actual drying process takes place in a cool, dry, well-ventilated area, where the materials are mixed several times to ensure even drying. Drying herbs are kept from exposure to the sun to prevent discoloration and oxidation. The drying process takes approximately six days in its entirety. Once dried, the leaves are removed and both components, leaves and flowers, are chopped finely. The final dried product weighs a third of the initial fresh weight and can be stored for up to 18 months.
The essential oil includes the chemicals thujone and phenol, which give it antiseptic properties. Its high concentrations of thujone and chemicals that stimulate the central nervous system, including pinocamphone and cineole, can provoke epileptic reactions. The oil of hyssop can cause seizures and even low doses (2–3 drops) can cause convulsions in children.
The fresh herb is commonly used in cooking. Essence of hyssop can be obtained by steaming, and is used in cooking to a lesser extent.
Herb hyssop leaves are used as an aromatic condiment. The leaves have a lightly bitter taste due to its tannins, and an intense minty aroma. Due to its intensity, it is used moderately in cooking. The herb is also used to flavor liqueur, and is part of the official formulation of Chartreuse.
- Prof. Dr. Otto Wilhelm Thomé, Flora von Deutschland, Österreich und der Schweiz 1885, Gera, Germany
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- From Chaeremon's History of Egypt, as quoted by Porphyry, De Abstinentia IV.6.9.
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