View source for Blue agave

{{Short description|Plant species in the asparagus family}}
{{Speciesbox
| name = Blue agave
| image = Agave tequilana 1.jpg
| genus = Agave
| species = tequilana
| authority = [[F.A.C.Weber]]
| synonyms_ref = <ref name="POWO" />
| synonyms = {{Collapsible list | {{Species list
 | Agave angustifolia subsp. tequilana | (F.A.C.Weber) Valenz.-Zap. & Nabhan
 | Agave palmaris | Trel.
 | Agave pedrosana | Trel.
 | Agave pes-mulae | Trel.
 | Agave pseudotequilana | Trel.
}}
}}
}}

'''''Agave tequilana''''', commonly called '''blue Weber agave''' ('''{{italics correction|''agave azul''}}''') or '''tequila agave''', is an [[agave]] plant that is an important economic product of [[Jalisco]] state of Mexico, due to its role as the base ingredient of [[tequila]]. The high production of agavins (branched [[oligosaccharide|oligosaccharides]] composed mostly of [[fructose]]) in the core of the plant is the main characteristic that makes it suitable for the preparation of alcoholic beverages.

The tequila agave is native to the states of [[Jalisco]], [[Colima]], [[Nayarit]], [[Michoacán]], and [[Aguascalientes]] in Mexico. The plant favors altitudes of more than {{convert|1500|m|ft|-3}} and grows in rich and sandy soils. Blue agave plants grow into large [[succulents]], with spiky fleshy leaves, that can reach over {{convert|2|m|ft|0}} in height. Blue agaves sprout a stalk when they are about five years old. These stalks can grow an additional {{convert|5|m|ft}}, and they are topped with yellow flowers.<ref>Gentry, Howard Scott. ''Agaves of Continental North America''. University of Arizona Press, Tucson, 1992.</ref><ref>Weber, Frederic Albert Constantin. ''Bulletin du Muséum d'Histoire Naturelle'' 8(3): 220–223, f. 1–2. 1902.</ref> The stalk is cut off from commercial plants so the plant will put more energy into the heart.<ref name="chadwick-harvest">{{Cite web |last=Chadwick |first=Ian |date=June 27, 2007 |title=In Search of the Blue Agave: Harvesting Agave for Tequila |url=http://www.ianchadwick.com/tequila/harvesting.htm |access-date=2011-11-06 |publisher=Ianchadwick.com}}</ref>

The flowers are pollinated by the [[greater long-nosed bat]], as well as insects and hummingbirds, and produce several thousand seeds per plant, many of them sterile. The plant then dies. Cultivated plants are reproduced by planting the previously removed shoots; this has led to a considerable loss of genetic diversity in cultivated blue agave.

It is rarely kept as a [[houseplant]], but a 50-year-old blue agave in [[Boston]] grew a {{convert|30|ft|m|0|adj=on|abbr=on|order=flip}} stalk requiring a hole in the greenhouse roof and flowered in the summer of 2006.<ref>{{Cite AV media |title=Agave on Beacon Hill, Boston |type=Television news clip |newspaper=WLVI-TV |orig-date=Uploaded 2006-08-04 by Andreas Matern |url=https://www.youtube.com/watch?v=6idrlI9erV0 |archive-url=https://ghostarchive.org/varchive/youtube/20211221/6idrlI9erV0 |archive-date=2021-12-21 |url-status=dead|via=Youtube}}{{cbignore}}</ref>

==Taxonomy==
''Agave tequilana'' was only scientifically described as a species in 1902 by [[Frédéric Albert Constantin Weber]].<ref name="POWO">{{cite POWO |id=6729-2 |title=''Agave tequilana'' F.A.C.Weber |access-date=1 April 2025}}</ref> It is listed as an accepted species by [[Plants of the World Online]],<ref name="POWO" /> [[World Flora Online]],<ref>{{Cite WFO |title=''Agave tequilana'' F.A.C.Weber |id=0000754855 |access-date=1 April 2025}}</ref> and World Plants.<ref name="Hassler 2025">{{cite web |last1=Hassler |first1=Michael |date=1 April 2025 |title=Synonymic Checklist and Distribution of the World Flora. Version 25.04 |url=https://www.worldplants.de/ |website=World Plants |language=en |access-date=1 April 2025}}</ref> Though accepted as a species {{As of|2025|lc=y}}, due to the similarity to ''[[Agave angustifolia]]'' a scientific description of it as subspecies was published in 2004.<ref name="POWO" />

==Tequila production==
[[File:Agave tequilana0.jpg|thumb|right|''Agave tequilana'' 'Weber's Azul']]
[[Tequila]] is made only from a specific cultivar of ''Agave tequilana'' called "Weber Azul." The plant is from the [[Asparagaceae]] family. This cultivar is larger and blue-gray in color compared to the smaller and green normal ''A.&nbsp;tequilana''. It is a rapid grower and prolific [[Offset (botany)|offsetter]] in keeping with its agricultural advantages. Tequila is produced by removing the heart (''piña'') of the plant in its seventh to fourteenth year (depending on growth rate and whims of harvester). Harvested ''piñas'' normally weigh {{convert|80|-|200|lb|kg|-1|abbr=on|order=flip}}.<ref name="chadwick-harvest" /> This heart is stripped of its leaves and heated to convert the [[inulin]] to sugars. Then the roasted core is pressed or crushed to release the sugary clear liquid called [[aguamiel]], which is, in turn, fermented and distilled into [[ethanol|alcohol]]. Tequila is also made with a sugar formulation of 51% agave and 49% other sugars. These tequilas are referred to as Mixtos.<ref name="chadwick-mixto">{{Cite web |last=Chadwick |first=Ian |title=In Search of the Blue Agave: Pure agave and mixto tequilas |url=http://www.ianchadwick.com/tequila/pure_mixto.htm |publisher=Ianchadwick.com}}</ref>

==Pathogens affecting the plant==
[[File:Agave field in Jalisco, Mexico.jpg|thumb|alt=Straight rows of spiky leaved plants packed into rows, one after another, photographed from above. They make continuous gray-blue lines with only a few volunteer plants straying into the reddish areas bare soil between each row.|Agave field in Jalisco, Mexico]]
As agave production has moved to an industrial scale since the end of the 1980s, diseases and pests, collectively referred to as TMA (''tristeza y muerte de agave'', "wilting and death of agave"), have hit the crops. Through the 1990s, diseases spread, particularly ''[[Fusarium]]'' fungi and ''[[Erwinia]]'' bacteria, exacerbated by the low [[genetic diversity]] of the agave plants.<ref name="nature-dalton">{{Cite journal |last=Dalton |first=Rex |date=December 22, 2005 |title=Alcohol and science: Saving the agave |journal=Nature |volume=438 |issue=7071 |pages=1070–1071 |bibcode=2005Natur.438.1070D |doi=10.1038/4381070a |issn=0028-0836 |pmid=16371973 |s2cid=8758561|doi-access=free }}</ref> Other problems include the agave [[weevil]], ''[[Scyphophorus acupunctatus]]'',<ref>{{Cite journal |last=Altuzar |first=A. |last2=E. A. Malo |last3=H. Gonzalez-Hernandez |last4=J. C. Rojas |year=2007 |title=Electrophysiological and behavioural responses of ''Scyphophorus acupunctatus'' (Col., Curculionidae) to ''Agave tequilana'' volatiles |journal=Journal of Applied Entomology |volume=131 |issue=2 |pages=121–127 |doi=10.1111/j.1439-0418.2006.01135.x |s2cid=82440717}}</ref> and a fungus, ''[[Thielaviopsis paradoxa]]''.<ref>{{Cite conference |last=Martinez-Ramirez |first=J. |last2=P. Posos-Ponce |last3=J. Robles-Gomez |last4=K. Beas-Ruvalcaba |last5=L. Fucikovsky-Zak |title=Base leaf spot and a black rot of agave caused by Thielaviopsis paradoxa |url=http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO.2006.96.6.S1 |conference=2006 American Phytopathological Society Annual Meeting |location=Quebec City, Canada |volume=96 |pages=S74 |doi=10.1094/PHYTO.2006.96.6.S1 |doi-access=free |book-title=Phytopathology|url-access=subscription |hdl=11449/39276 |hdl-access=free }}</ref>

According to a 2004 study, additional pathogens, ''[[Erwinia carotovora]]'', ''[[Enterobacter agglomerans]]'', ''[[Pseudomonas mendocina]]'', and ''[[Serratia]]'' spp. are responsible for continued rot.<ref>{{Cite journal |last=Jimenez-Hidalgo |first=I. |last2=Virgen |first2=G. |last3=Martinez |first3=D. |last4=Vandemark |first4=G.J. |last5=Alejo |first5=J. |last6=Olalde |first6=V. |date=March 2004 |title=Identification and characterization of soft rot bacteria of agave tequilana weber var.azul |url=https://www.ars.usda.gov/research/publications/publication/?seqNo115=142278 |journal=European Journal of Plant Pathology |volume=110 |pages=317–331 |doi=10.1023/B:EJPP.0000019791.81935.6d |s2cid=28303844|url-access=subscription }}</ref>

==See also==
* [[Agave nectar]]
* [[Agave wine]]

==References==
{{Commons category|position=left|Agave tequilana}}
{{Reflist|30em}}

{{Taxonbar|from=Q311065}}

[[Category:Agave]]
[[Category:Flora of Jalisco]]