Editing Thuja (section)

==Uses of thuja==
They are widely grown as [[ornamental tree]]s, and extensively used for [[hedge (barrier)|hedges]]. A number of cultivars are grown and used in landscapes.<ref>{{cite web |first=Mark H. |last=Brand |date=2001 |title=Thuja plicata |url=http://www.hort.uconn.edu/plants/t/thupli/thupli1.html |website=UConn Plant Database |publisher=University of Connecticut |archive-url=https://web.archive.org/web/20071029202830/http://www.hort.uconn.edu/plants/t/thupli/thupli1.html |archive-date=2007-10-29 }}</ref><ref>{{cite web |first=Mark H. |last=Brand |date=2001 |title=Thuja occidentalis |url=http://www.hort.uconn.edu/plants/t/thuocc/thuocc1.html |website=UConn Plant Database |publisher=University of Connecticut |archive-url=https://web.archive.org/web/20071021032615/http://www.hort.uconn.edu/plants/t/thuocc/thuocc1.html |archive-date=2007-10-21 }}</ref> Homeowners will sometimes plant them as privacy trees. The cultivar 'Green Giant' is popular as a very vigorous hedging plant, growing up to 80&nbsp;cm/year when young.<ref>{{Cite web |url=http://www.usna.usda.gov/Gardens/faqs/GreenGiant.html |title=U.S. National Arboretum: Gardens: FAQs: 'Green Giant' Arborvitae<!-- Bot generated title --> |access-date=2008-01-23 |archive-date=2013-01-27 |archive-url=https://web.archive.org/web/20130127021253/http://www.usna.usda.gov/Gardens/faqs/GreenGiant.html |url-status=dead }}</ref>

The [[wood]] is light, soft and aromatic. It can be easily split and resists decay. The wood has been used for many applications from making chests that repel moths to shingles. ''Thuja'' poles are also often used to make fence posts and rails. The wood of ''Thuja plicata'' is commonly used for [[guitar]] [[sound board (music)|sound board]]s.<ref>{{cite book|last=Bucur |first=Voichita |date=1995 |title=Acoustics of wood |place=Boca Raton |publisher=CRC Press |doi=10.1201/9780203710128}}</ref> Its combination of light weight and resistance to decay has also led to ''T. plicata'' being widely used for the construction of bee hives.<ref>{{cite web |last1=Owano |first1=Nacy |title=Flow Hive 2 sees sweet success in offering new features for honey on tap |url=https://techxplore.com/news/2018-03-hive-sweet-success-features-honey.html |website=Tech Xplore |access-date=15 October 2022}}</ref>

''T. plicata'' is an important tree to the First Nations people of the Pacific Northwest and is sometimes called "Canoe Tree" because of its use as a material for Native American canoes.{{citation needed|date=September 2021}}

Oil of ''Thuja'' contains the [[terpene]] [[thujone]] which has been studied for its [[GABA]] receptor antagonizing effects, with potentially lethal properties.<ref name="pmid10725394">{{cite journal |vauthors=Höld KM, Sirisoma NS, Ikeda T, Narahashi T, Casida JE |title=Alpha-thujone (the active component of absinthe): gamma-aminobutyric acid type A receptor modulation and metabolic detoxification |journal=[[Proceedings of the National Academy of Sciences of the United States of America|Proc. Natl. Acad. Sci. U.S.A.]] |volume=97 |issue=8 |pages=3826–31 |year=2000 |pmid=10725394 |doi=10.1073/pnas.070042397 |pmc=18101|bibcode=2000PNAS...97.3826H |doi-access=free }}</ref> Cedarwood oil and cedar leaf oil, which are derived from ''Thuja occidentalis'', have different properties and uses.<ref>{{cite web | url=http://cedarleafcanada.com/faq/cedarwood-oil-vs-cedar-leaf-oil/ | title=Cedarwood Oil Vs Cedar Leaf Oil | publisher=Cedar Leaf Canada | access-date=16 June 2015}}</ref>

The natives of Canada used the scaled leaves of ''Thuja occidentalis'' to make a tea that has been shown to contain 50&nbsp;mg of vitamin C per 100&nbsp;grams; this helped prevent and treat [[scurvy]].<ref name="silvics">{{Silvics |volume=1 |genus=Thuja |species=occidentalis |first=William F. |last=Johnston}}</ref>

In the 19th century, ''Thuja'' was commonly used as an externally applied tincture or ointment for the treatment of [[wart]]s, [[dermatophytosis|ringworm]] and [[candidiasis|thrush]],<ref>{{cite book |first=David |last=Hoffmann |title=Medical Herbalism: Principles and Practices |publisher=Healing Arts Press |year=2003 |page=588 |isbn=978-0-89281-749-8 }}</ref> and a local injection of the tincture was used for treating [[genital wart|venereal warts]].<ref>{{cite book |first=M. |last=Grieve |title=A Modern Herbal |location=London |publisher=Jonathan Cape |year=1931 |page=177 }}</ref>

A 2017 trial showed that its extract effectively killed both gram-positive and gram-negative bacteria.<ref>{{Cite journal|last1=Sah|first1=Shiv Nandan|last2=Regmi|first2=Sunil|last3=Tamang|first3=Man Kumar|date=2017-06-29|title=Antibacterial Effects of Thuja Leaves Extract|journal=International Journal of Applied Sciences and Biotechnology|language=en|volume=5|issue=2|pages=256–260|doi=10.3126/ijasbt.v5i2.17617|issn=2091-2609|doi-access=free}}</ref>

As with many Cupressaceae, ''Thuja'' can induce allergic reactions, including skin, eye and breathing problems.{{citation needed|date=September 2021}}