Hyssopus decumbens Jord. & Fourr.
Hyssopus officinalis, hyssop is a 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 an aromatic herb and medicinal plant.
Hyssop is a brightly coloured shrub or subshrub that ranges from 30 to 60 cm 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 long.
History and cultivation 
Hyssop has been in use since Classical antiquity. Its name is a direct adaptation from the Greek ὕσσωπος . The Hebrew word אזוב (esov or esob) and the Greek word ὕσσωπος probably share a common (unknown) origin. The name hyssop appears in some translations of the 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. The biblical plant translated as hyssop is discussed further at ezov.
'Miserere mei' by Gregorio Allegri includes the words from Psalm 51 'Asparges me hysopo et mundabor', translated as 'Purify me with hyssop and I will be clean'.
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're 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 areas, where the materials are mixed various times. 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 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 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.
Medicinal uses 
As a medicinal herb, hyssop has soothing, expectorant, and cough suppressant properties. The plant also includes the chemicals thujone and phenol, which give it antiseptic properties. Its high concentrations of thujone and chemicals that stimulate the central nervous system can provoke epileptic reactions when taken in high-enough doses. The oil of hyssop can cause seizures and even low doses (2-3 drops) can cause convulsions in children.
- Pérez Maté, P. (2002). Especies aromáticas y medicinales. Buenos Aires: INTA. . (Spanish)
- Oxford English Dictionary, 2nd Edition, 1989, s.v. hyssop
- Grieve, M. "Hyssop: A Modern Herbal". Botanical.com.
- van Wyk, Ben-Erik; Wink, Michael (2004). Medicinal Plants of the World (1 ed.). Timber Press, Incorporated. ISBN 978-0-88192-602-6, p 177.
- Hyssop, WebMD
- Crellin, John; Philpott, Jane (1997). A Reference Guide to Medicinal Plants: Herbal Medicine Past and Present. Duke University Press. ISBN 978-0-8223-1019-8
- Media related to Hyssopus officinalis at Wikimedia Commons
- Data related to Hyssopus officinalis at Wikispecies
- The Herb Companion An article on Hyssop