Horseradish

Horseradish grows up to {{convert|1.5|m|ft|abbr=off|sp=us|0}} tall, with hairless bright green unlobed leaves up to {{convert|1|m|ftin|abbr=on}} long that may be mistaken for docks (Rumex).{{cite book|last=Stace|first=C. A.|author-link = Stace, C. A.|year=2019|title=New Flora of the British Isles|edition=Fourth|publisher=C & M Floristics|location = Middlewood Green, Suffolk, U.K.| isbn=978-1-5272-2630-2}}{{rp|423}} It is cultivated primarily for its large, white, tapered root.{{cite web| url = http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200009237| title = Flora of North America, Armoracia rusticana P. Gaertner, B. Meyer & Scherbius, Oekon. Fl. Wetterau. 2: 426. 1800}}{{cite web| url = http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200009237| title = Flora of China, Armoracia rusticana P. Gaertner et al.}}[http://luirig.altervista.org/flora/taxa/index1.php?scientific-name=armoracia+rusticana Altervista Flora Italiana, Rafano rusticano, Meerrettich, Armoracia rusticana P. Gaertn., B. Mey. & Scherb.] includes photos and European distribution map{{cite web| url = http://bonap.net/MapGallery/County/Armoracia%20rusticana.png| title = Biota of North America Program 2014 county distribution map}} The white four-petalled flowers are scented and are borne in dense panicles. Established plants may form extensive patches and may become invasive unless carefully managed.{{cite web |url=https://www.rhs.org.uk/advice/grow-your-own/herbs/horseradish |publisher=Royal Horticultural Society |title=Horseradish |access-date=17 May 2020 }}

Intact horseradish root has little aroma. When cut or grated, enzymes from within the plant cells digest sinigrin (a glucosinolate) to produce allyl isothiocyanate (mustard oil), which irritates the mucous membranes of the sinuses and eyes. Once exposed to air or heat, horseradish loses its pungency, darkens in color, and develops a bitter flavor.

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Horseradish has been cultivated since antiquity. Dioscorides listed horseradish equally as Persicon sinapi (Diosc. 2.186) or Sinapi persicum (Diosc. 2.168),Early Modern translators of Dioscurides offered various names. which Pliny's Natural History reported as Persicon napy;{{cite web| url = https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.02.0137%3Abook%3D27%3Achapter%3D113| title = Pliny on Thlaspi or Persicon napy H.N. i. 37.113}} Cato discusses the plant in his treatises on agriculture. A mural in Ostia Antica shows the plant. Horseradish is probably the plant mentioned by Pliny the Elder in his Natural History under the name of Amoracia, and recommended by him for its medicinal qualities, and possibly the wild radish, or raphanos agrios of the Greeks. The early Renaissance herbalists Pietro Andrea Mattioli and John Gerard showed it under Raphanus.{{cite journal| last1 = Courter | first1 = J. W. | last2 = Rhodes | first2 = A. M.| doi = 10.1007/BF02860621| title = Historical notes on horseradish | journal = Economic Botany| volume = 23| issue = 2| pages = 156–164|date=April–June 1969| jstor = 4253036| s2cid = 23966751}} Its modern Linnaean genus Armoracia was first applied to it by Heinrich Bernhard Ruppius, in his Flora Jenensis, 1745, but Linnaeus himself called it Cochlearia armoracia.

Both roots and leaves were used as a traditional medicine during the Middle Ages. The root was used as a condiment on meats in Germany, Scandinavia, and Britain. It was introduced to North America during European colonization; both George Washington and Thomas Jefferson mention horseradish in garden accounts.Ann Leighton, American Gardens in the Eighteenth Century: 'For Use or Delight' , 1976, p.431. Native Americans used it to stimulate the glands, stave off scurvy, and as a diaphoretic treatment for the common cold.{{Cite book|last=Lyle|first=Katie Letcher|url=https://www.worldcat.org/oclc/560560606|title=The Complete Guide to Edible Wild Plants, Mushrooms, Fruits, and Nuts: How to Find, Identify, and Cook Them|publisher=FalconGuides|year=2010|isbn=978-1-59921-887-8|edition=2nd|location=Guilford, CN|pages=153–154|oclc=560560606|orig-year=2004}}

William Turner mentions horseradish as Red Cole in his "Herbal" (1551–1568), but not as a condiment. In The Herball, or Generall Historie of Plantes (1597), John Gerard describes it under the name of raphanus rusticanus, stating that it occurs wild in several parts of England. After referring to its medicinal uses, he says:

{{Blockquote|[T]he Horse Radish stamped with a little vinegar put thereto, is commonly used among the Germans for sauce to eat fish with and such like meats as we do mustard.{{cite book|last=Phillips|first=Henry |title=History of Cultivated Vegetables|publisher=H. Colburn and Co.|year=1822|page=[https://archive.org/details/historycultivat00philgoog/page/n270 255]|url=https://archive.org/details/historycultivat00philgoog|isbn=978-1-4369-9965-6}}}}

The word horseradish is attested in English from the 1590s. It combines the word horse (formerly used in a figurative sense to mean strong or coarse, as with archaic horsepistol and horselock) and the word radish.{{cite web|last=Harper|first=Douglas|title=Online Etymology Dictionary: horseradish|url=http://www.etymonline.com/index.php?allowed_in_frame=0&search=horseradish&searchmode=none|access-date=18 November 2012}} Some sources say that the term originates from a mispronunciation of the German word "meerrettich" as "mareradish".{{Cite web |title=Horseradish History {{!}} |url=https://horseradish.org/horseradish-facts/horseradish-history/ |access-date=2023-03-16 |website=horseradish.org}}{{Cite web |last=Wright |first=Janine |date=2010 |title=The Herb Society of America's Essential Guide to Horseradish |url=https://www.herbsociety.org/file_download/inline/00a657ad-4bfa-4db8-945f-526586c09c2f |url-status=live |archive-url=https://web.archive.org/web/20180405060030/https://www.herbsociety.org/file_download/inline/00a657ad-4bfa-4db8-945f-526586c09c2f |archive-date=5 April 2018 |access-date=15 March 2023 |website=Herb Society of America}}{{Cite web |last=Trinklein |first=David |date=1 July 2011 |title=Horseradish: America's Favorite Root? |url=https://ipm.missouri.edu/MEG/2011/7/Horseradish-Americas-Favorite-Root/ |url-status=live |archive-url=https://web.archive.org/web/20220525130928/https://ipm.missouri.edu/MEG/2011/7/Horseradish-Americas-Favorite-Root/ |archive-date=25 May 2022 |access-date=15 March 2023 |website=Integrated Pest Management: University of Missouri}} However, this hypothesis has been disputed, as there is no historical evidence of this term being used.{{Cite web |date=2014-01-24 |title=How Was Horseradish Named? Did Horses Eat It? |url=https://culinarylore.com/food-history:how-was-horseradish-named/ |access-date=2023-03-16 |website=CulinaryLore |language=en-US}}

{{more citations needed|section|date=November 2019}}

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Horseradish is perennial in hardiness zones 2–9 and can be grown as an annual in other zones, although not as successfully as in zones with both a long growing season and winter temperatures cold enough to ensure plant dormancy. After the first frost in autumn kills the leaves, the root is dug and divided. The main root is harvested and one or more large offshoots of the main root are replanted to produce next year's crop. Horseradish left undisturbed in the garden spreads via underground shoots and can become invasive. Older roots left in the ground become woody, after which they are no longer culinarily useful, although older plants can be dug and re-divided to start new plants. The early season leaves can be distinctively different, asymmetric spiky before the mature typical flat broad leaves start to be developed.

Introduced by accident, "cabbageworms", the larvae of Pieris rapae, are a common caterpillar pest in horseradish. Mature caterpillars chew large, ragged holes in the leaves leaving the large veins intact. Handpicking is an effective control strategy in home gardens.{{cite web |url=http://www.extension.umn.edu/yardandgarden/ygbriefs/e253caterpillarpests-cole.html |title=Caterpillar Pests of Cole Crops in Home Gardens |access-date=2007-09-30 |author=Suzanne Wold-Burkness and Jeff Hahn |publisher=University of Minnesota |url-status=dead |archive-url=https://web.archive.org/web/20071002043657/http://www.extension.umn.edu/yardandgarden/ygbriefs/e253caterpillarpests-cole.html |archive-date=2007-10-02 }} Another common pest of horseradish is the mustard leaf beetle (Phaedon cochleariae).{{Cite journal |last1=Gross |first1=Jürgen |last2=Müller |first2=Caroline |last3=Vilcinskas |first3=Andreas |last4=Hilker |first4=Monika |date=November 1998 |title=Antimicrobial Activity of Exocrine Glandular Secretions, Hemolymph, and Larval Regurgitate of the Mustard Leaf BeetlePhaedon cochleariae |url=https://linkinghub.elsevier.com/retrieve/pii/S0022201198947814 |journal=Journal of Invertebrate Pathology |language=en |volume=72 |issue=3 |pages=296–303 |doi=10.1006/jipa.1998.4781 |pmid=9784354|url-access=subscription }} These beetles are undeterred by the defense mechanisms produced by Brassicaceae plants like horseradish.{{cite journal |last1=Friedrichs |first1=Jeanne |last2=Schweiger |first2=Rabea |last3=Geisler |first3=Svenja |last4=Mix |first4=Andreas |last5=Wittstock |first5=Ute |last6=Müller |first6=Caroline |date=September 2020 |title=Novel glucosinolate metabolism in larvae of the leaf beetle Phaedon cochleariae |journal=Insect Biochemistry and Molecular Biology |volume=124 |pages=103431 |doi=10.1016/j.ibmb.2020.103431 |pmid=32653632}}

In the United States, horseradish is grown in several areas, such as Eau Claire, Wisconsin, and Tule Lake, California. The most concentrated growth occurs in the Collinsville, Illinois, region.{{Cite journal|last1=Walters|first1=S. Alan|last2=Wahle|first2=Elizabeth A.|date=2010-04-01|title=Horseradish Production in Illinois|url=https://journals.ashs.org/horttech/view/journals/horttech/20/2/article-p267.xml|journal=HortTechnology|language=en-US|volume=20|issue=2|pages=267–276|doi=10.21273/HORTTECH.20.2.267|issn=1943-7714|doi-access=free}}

Thirty thousand metric tonnes of horseradish are produced in Europe annually, of which Hungary produces 12,000, making it the biggest single producer.{{cite news |last=Albert |first=Dénes |date=29 March 2021 |title=Hungary is Europe's horseradish production king |url= https://rmx.news/article/article/hungary-is-europe-s-horseradish-production-king|work=Remix News |access-date=30 April 2021}}

File:Allyl-isothiocyanate-2D-skeletal.png

The distinctive pungent taste of horseradish is from the compound allyl isothiocyanate. Upon crushing the flesh of horseradish, the enzyme myrosinase is released and acts on the glucosinolates sinigrin and gluconasturtiin, which are precursors to the allyl isothiocyanate.{{citation needed|date=September 2019}} The allyl isothiocyanate serves the plant as a natural defense against herbivores. Since allyl isothiocyanate hurts the plant, it is stored in the harmless form of glucosinolate, separate from the enzyme myrosinase. When an animal chews the plant, the allyl isothiocyanate is released, repelling the animal. Allyl isothiocyanate is an unstable compound, degrading over days at {{convert|37|C}}.{{cite journal | last1 = Ohta | first1 = Yoshio | last2 = Takatani | first2 = Kenichi | last3 = Kawakishi | first3 = Shunro | year = 1995 | title = Decomposition Rate of Allyl Isothiocyanate in Aqueous Solution | journal = Bioscience, Biotechnology, and Biochemistry | volume = 59 | pages = 102–103 | doi = 10.1271/bbb.59.102 }} Because of this instability, horseradish sauces lack the pungency of freshly crushed roots.

Cooks may use the terms "horseradish" or "prepared horseradish" to refer to the mashed (or grated) root of the horseradish plant mixed with vinegar. Prepared horseradish is white to creamy beige. It can be stored for up to 3 months under refrigeration,{{cite web |last1=Nathan |first1=Joan |title=Prepared Horseradish Recipe |url=https://cooking.nytimes.com/recipes/1020118-prepared-horseradish |website=NYT Cooking |access-date=16 June 2022}} but eventually will darken, indicating less flavour.{{citation needed|date=April 2020}} The leaves of the plant are edible, either cooked or raw when young,{{Cite book|last=Angier|first=Bradford|url=https://archive.org/details/fieldguidetoedib00angi/page/104/mode/2up|title=Field Guide to Edible Wild Plants|publisher=Stackpole Books|year=1974|isbn=0-8117-0616-8|location=Harrisburg, PA|pages=104|oclc=799792|author-link=Bradford Angier}} with a flavor similar but weaker than the roots.

On Passover, many Ashkenazi Jews use grated horseradish as a choice for Maror (bitter herbs) at the Passover Seder.{{cite news |last=Kordova |first=Shoshana |url=https://www.haaretz.com/israel-news/what-is-a-seder-plate-1.10703172 |title=What Goes on a Seder Plate? |newspaper=Haaretz |date=12 April 2022 |access-date=20 April 2022}}

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Horseradish sauce made from grated horseradish root and vinegar is a common condiment in the United Kingdom, in Denmark (with sugar added) and in Poland.{{cite book|first1=Mina|last1=Holland|title=The Edible Atlas: Around the World in Thirty-Nine Cuisines|url=https://books.google.com/books?id=wXH5AQAAQBAJ|year=2014|publisher=Canongate Books|isbn=978-0-85786-856-5|page=158}} In the UK, it is usually served with roast beef, often as part of a traditional Sunday roast, but can be used in a number of other dishes, including sandwiches or salads. A variation of horseradish sauce, which in some cases may replace the vinegar with other products like lemon juice or citric acid, is known in Germany as Tafelmeerrettich. Also available in the UK is Tewkesbury mustard, a blend of mustard and grated horseradish originating in medieval times and mentioned by Shakespeare (Falstaff says: "his wit's as thick as Tewkesbury Mustard" in Henry IV Part II{{cite web|url=http://www.opensourceshakespeare.org/views/plays/play_view.php?WorkID=henry4p2&Act=2&Scene=4&Scope=scene&LineHighlight=1521#1521|title=Henry IV, Part II, Scene 4|access-date=2008-05-10|publisher=opensourceshakespeare.org|archive-url=https://web.archive.org/web/20110716112320/http://www.opensourceshakespeare.org/views/plays/play_view.php?WorkID=henry4p2&Act=2&Scene=4&Scope=scene&LineHighlight=1521#1521|archive-date=2011-07-16|url-status=dead}}). A similar mustard, called Krensenf or Meerrettichsenf, is common in Austria and parts of Germany. In France, sauce au raifort is used in Alsatian cuisine. In Russia, horseradish root is usually mixed with grated garlic and a small amount of tomatoes for color (Khrenovina sauce).

In the United States, the term "horseradish sauce" refers to grated horseradish combined with mayonnaise or salad dressing. In Denmark, it is mixed with whipping cream and as such used on top of traditional Danish open sandwiches with beef (boiled or steaked) slices. Prepared horseradish is a common ingredient in Bloody Mary cocktails and in cocktail sauce and is used as a sauce or sandwich spread. Horseradish cream is a mixture of horseradish and sour cream and is served au jus for a prime rib dinner.{{cite web|url=https://www.seriouseats.com/sauced-horseradish-cream-sauce|title=Horseradish Cream}}

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In Europe, there are two varieties of chrain. "Red" chrain is mixed with red beetroot and "white" chrain contains no beetroot. Chrain is a part of Christian Easter and Jewish Passover tradition (as maror) in Eastern and Central Europe. In the Christian tradition, horseradish is eaten during Eastertide (Paschaltide) as "is a reminder of the bitterness of Jesus' suffering" on Good Friday.{{cite book |last1=Silverman |first1=Deborah Anders |title=Polish-American Folklore |date=2000 |publisher=University of Illinois Press |isbn=978-0-252-02569-3 |page=31-32 |language=en}}

• In parts of Southern Germany "kren" is a component of the traditional wedding dinner. It is served with cooked beef and a dip made from lingonberry to balance the slight hotness of the Kren.
• In Poland, a variety with red beetroot is called {{lang|pl|ćwikła z chrzanem}} or simply ćwikła.
• In Russia, a very popular ingredient for pickles (cucumbers, tomatoes, mushrooms).
• In Ashkenazi European Jewish cooking, beetroot horseradish is commonly served with gefilte fish.
• In Transylvania and other Romanian regions, red beetroot with horseradish is used as a salad served with lamb dishes at Easter called sfecla cu hrean.
• In Serbia, ren is an essential condiment with cooked meat and freshly roasted suckling pig.
• In Croatia, freshly grated horseradish (Croatian: Hren) is often eaten with boiled ham or beef.
• In Hungary, Slovenia, and in the adjacent Italian regions of Friuli-Venezia Giulia and the nearby Italian region of Veneto, horseradish (often grated and mixed with sour cream, vinegar, hard-boiled eggs, or apples) is also a traditional Easter dish.
• In the Italian regions of Lombardy, Emilia-Romagna, and Piedmont, it is called barbaforte (strong beard) and is a traditional accompaniment to bollito misto; while in northeastern regions like Trentino-Alto Adige/Südtirol,Giambattista Azzolini, Vocabolario vernacolo-italiano pei distretti roveretano e trentino, Venezia, Tip. e calc. di Giuseppe Grimaldo, 1856, [https://archive.org/stream/vocabolariovern00azzogoog#page/n140/mode/2up p. 120]. VenetoGiuseppe Boerio, Dizionario del dialetto veneziano, 3rd edition, Venezia, Reale tipografia di Giovanni Cecchini edit., 1867, [https://archive.org/details/dizionariodeldi00boergoog p. 207]. and Friuli-Venezia Giulia,[http://www.friul.net/dizionario_nazzi/nazzi_italiano_friulano.php?id=21420&x=1 Rafano rusticano] in www.friul.net.Jacopo Pirona, Vocabolario friulano, Venezia, coi tipi dello stabilimento Antonelli, 1871, [https://archive.org/stream/vocabolariofriu00pirogoog#page/n600/mode/2up p. 490]. it is still called kren or cren. In the southern region of Basilicata it is known as rafano and used for the preparation of rafanata, a main course made of horseradish, eggs, cheese and sausage.{{cite book |last= Zanini De Vita|first= Oretta |date= 2009|title= Encyclopedia of Pasta|url= https://archive.org/details/encyclopediaofpa00zani|url-access= registration|quote= rafanata horseradish.|publisher= University of California Press|page= [https://archive.org/details/encyclopediaofpa00zani/page/122 122]|isbn=978-0-520-25522-7|access-date= 24 June 2014}}
• Horseradish is also used as a main ingredient for soups. In Poland, horseradish soup is a common Easter Day dish.{{cite web |url=http://culture.polishsite.us/articles/art83.html |title=Horseradish Soup Recipe Updated with Photographs – Polish Easter Food |publisher=Culture.polishsite.us |access-date=2012-07-08 |archive-url=https://web.archive.org/web/20110930150641/http://culture.polishsite.us/articles/art83.html |archive-date=2011-09-30 |url-status=dead }}

Outside Japan, the Japanese condiment wasabi, although traditionally prepared from the true wasabi plant (Wasabia japonica), is now usually made with horseradish due to the scarcity of the wasabi plant.{{cite journal |last1=Arnaud |first1=Celia Henry |year=2010 |title= Wasabi: In condiments, horseradish stands in for the real thing|journal= Chemical & Engineering News |volume= 88 |issue= 12 |pages= 48 |url= http://cen.acs.org/articles/88/i12/Wasabi.html |access-date=11 November 2012 |doi=10.1021/cen-v088n012.p048|url-access= subscription }} The Japanese botanical name for horseradish is {{nihongo|seiyōwasabi|セイヨウワサビ, 西洋山葵}}, or "Western wasabi". Both plants are members of the family Brassicaceae.

In a 100-gram amount, prepared horseradish provides 48 calories and has a high content of vitamin C with moderate content of sodium, folate and dietary fiber, while other essential nutrients are negligible in content.{{cite web |title=Nutrient content of prepared horseradish per 100 g |url=https://fdc.nal.usda.gov/fdc-app.html#/food-details/173472/nutrients |publisher=FoodData Central, US Department of Agriculture |access-date=9 August 2023 |date=1 April 2018}} In a typical serving of one tablespoon (15 grams), horseradish supplies no significant nutrient content.

Horseradish contains volatile oils, notably mustard oil.{{cite journal | last1 = Cole | first1 = Rosemary A. | year = 1976 | title = Isothiocyanates, nitriles and thiocyanates as products of autolysis of glucosinolates in Cruciferae | journal = Phytochemistry | volume = 15 | issue = 5| pages = 759–762 | doi = 10.1016/S0031-9422(00)94437-6 | bibcode = 1976PChem..15..759C }}

The enzyme horseradish peroxidase (HRP), found in the plant, is used extensively in molecular biology and biochemistry primarily for its ability to amplify a weak signal and increase the detectability of a target molecule.{{cite journal | last1 = Bladha | first1 = K. Wedelsbäck | last2 = Olssonb | first2 = K. M. | year = 2011 | title = Introduction and use of horseradish (Armoracia rusticana) as food and medicine from antiquity to the present: Emphasis on the nordic countries | journal = Journal of Herbs, Spices and Medicinal Plants | volume = 17 | issue = 3| pages = 197–213 | doi = 10.1080/10496475.2011.595055 | s2cid = 84556980 }} HRP has been used in decades of research to visualize under microscopy and assess non-quantitatively the permeability of capillaries, particularly those of the brain.{{cite journal|pmid=15024715|year=2004|last1=Lossinsky|first1=A. S.|title=Structural pathways for macromolecular and cellular transport across the blood-brain barrier during inflammatory conditions. Review|journal=Histology and Histopathology|volume=19|issue=2|pages=535–64|last2=Shivers|first2=R. R.|doi=10.14670/HH-19.535}}

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