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Hierochloe odorata or Anthoxanthum nitens (commonly known as sweet grass, manna grass, Mary’s grass or vanilla grass, and as holy grass in the UK, bison grass e.g. by Polish vodka producers) is an aromatic herb native to northern Eurasia and North America. It is used in herbal medicine and in the production of distilled beverages (e.g., Żubrówka, Wisent). It owes its distinctive sweet scent to the presence of coumarin.
Hierochloe odorata is a very hardy perennial, able to grow to the Arctic Circle. Its leaves do not have rigid stems, so only grow to about 20 cm (7.9 in) in height, and then the leaves grow outward horizontally to 100 cm (39 in) long or more, by late summer. The base of the leaf, just below the soil surface, is broad and white, without hairs; the underside of the leaf is shiny, without hairs. In the wild, the bases of the leaves are frequently purple-red colored, and this indicates a phosphorus-deficient soil.
There are several strains of sweetgrass — a regular strain that can be harvested once or twice a year, and a naturally occurring polyploid strain, which is much faster growing and can be harvested three to five times a year.
The name Hierochloe odorata is from the Greek and Latin. Hierochloe means "holy grass" and odorata means "fragrant". Some authors include Hierochloe in Anthoxanthum; in this case this species is given the epithet nitens to avoid confusion with a different species, Anthoxanthum odoratum, sweet vernal grass.
Propagation is easiest by cutting out plugs from established plants. Grown in sun or partial shade, they do not like drought. Seeds are usually not viable, or if they are, take two to three years to develop a robust root system.
In North America Hierochloe odorata occurs in southern Canada, northern Great Plains/Rocky Mountains and northwest of U.S., and New England. In continental Europe it occurs north from Switzerland. There is only one site in Ireland, and it is recorded in four counties of Scotland.
The plant is harvested by cutting grass in early to late summer at the desired length. Hierochloe odorata harvested after the first frost has little or no scent and is less desirable for basketry. Basketweavers sun-dry cut sweet grass until it is dry and brittle. The brittle form of sweet grass must be soaked in warm water until it becomes pliable. The pliable grass is typically braided into thick threads and then redried for use.
Holy grass was strewn before church doors on saints' days in northern Europe, presumably because of the sweet smell that arose when it was trodden on. It was used in France to flavor candy, tobacco, soft drinks, and perfumes. In Europe, the species Hierochloe alpina is frequently substituted or used interchangeably. In Russia, it was used to flavor tea. It is still used in flavored vodka, the most notable example being Polish Żubrówka.
Native American traditions
Sweet grass is widely used by North American indigenous peoples from many different Nations. Among many of the Plains Indians is considered one of the "four sacred medicines". Though being used for many purposes, its main purpose for many tribes is to attract good spirits. It is also known as the "Hair of Mother Earth".
- Hope, Tom, & Gray, Alan, Grasses of the British Isles: BSBI Handbook No. 13, Botanical Society of the British Isles, 2009, p 311. ISBN 978-0-901158-42-0.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
- Krasińska, M.; Krasińska, Z. (2013). "Food and Use of the Environment". European Bison. Springer Berlin Heidelberg. pp. 157–179.
- Sweetgrass Growing information. Redwood City Seed Company. http://www.ecoseeds.com/sweetgrass.html
- "Mosquito-repelling chemicals identified in traditional sweetgrass".
- Hierochloe odorata (L.) P. Beauv., USDA PLANTS