Yarn bombing (or yarnbombing) is a type of graffiti or street art that employs colourful displays of knitted or crocheted yarn or fibre rather than paint or chalk. It is also called yarn storming, guerrilla knitting, kniffiti, urban knitting, or graffiti knitting.
While yarn installations – called yarn bombs or yarnstorms – may last for years, they are considered non-permanent, and, unlike other forms of graffiti, can be easily removed if necessary. Nonetheless, the practice is still technically illegal in some jurisdictions, though it is not often prosecuted vigorously.
While other forms of graffiti may be expressive, decorative, territorial, socio-political commentary, advertising or vandalism, yarn bombing was initially almost exclusively about reclaiming and personalizing sterile or cold public places. It has since developed with groups graffiti knitting and crocheting worldwide, each with their own agendas and public graffiti knitting projects being run.
According to Manuela Farinosi and Leopoldina Fortunati, yarn bombing has become synonymous with the current feminist movement due in part to the reclamation of a traditionally feminine act (i.e. knitting and/or crocheting) to partake in the traditionally masculine and male-dominated graffiti scene. The women and girls who make up the yarn bombing subculture are diverse in race, age, sexuality, class, etc. and create space for themselves and their art everywhere from college campuses to public parks. This creation and preservation of space is what motivates some of the participants, some of whom have never been able to access a political art space before. In her article about yarn bombing, Joanna Mann explains the balance between the art and politics, "Yarn bombing, I argue, does more than feminise the city, for the whimsy with which it is imbued has the capacity to increase our attentiveness to habitual worlds in a series of micro-political gestures." 
The practice is believed to have originated in the U.S. with Texas knitters trying to find a creative way to use their leftover and unfinished knitting projects, but it has since spread worldwide.
The start of this movement has been attributed to Magda Sayeg, 37, from Houston, who says she first got the idea in 2005 when she covered the door handle of her boutique with a custom-made cozy.
Houston artist Bill Davenport was creating and exhibiting crochet-covered objects in Houston in the 1990s, and the Houston Press stated that "Bill Davenport could be called the grand old man of Houston crocheted sculpture." Artist Shanon Schollian was knitting stump cozies in 2002 for clear cuts in Oregon. The Knit Knot Tree by the Jafagirls in Yellow Springs, Ohio gained international attention in 2008.
The movement moved on from simple 'cozies' with the innovation of the 'stitched story'. The concept has been attributed to Lauren O'Farrell (who creates her street art under the graffiti knitting name Deadly Knitshade), from London, UK, who founded the city's first graffiti knitting collective Knit the City. The 'stitched story concept' uses handmade amigurumi creatures, characters and items to tell a narrative or show a theme. This was first recorded with the Knit the City collective's "Web of Woe" installation in August 2009.
Yarn bombing's popularity has spread throughout the world. In Oklahoma City the Collected Thread store yarn bombed the Plaza District of the city on 9 September 2011 to celebrate their three-year anniversary as a functioning shop. and in Australia a group called the Twilight Taggers refer to themselves as 'fibre artists'. Joann Matvichuk of Lethbridge, Alberta founded International Yarnbombing Day, which was first observed on 11 June 2011.
Although yarnbomb installations are typically found in urban areas, Stephen Duneier, aka Yarnbomber, was the first to introduce it into the wilderness with numerous permitted projects in Los Padres National Forest beginning in 2012.
The Craft Club Yarnbombers (Emma Curley, Helen Thomas, Gabby Atkins, Claire Whitehead and Rebecca Burton) became Guinness World Record holders for the largest display of crochet sculptures, when they yarnbombed a children's hospice with 13,388 crocheted items. They have also brought yarnbombing to their community in Essex with their postbox yarnbombs.
Yarn Bombing Los Angeles (YBLA) is a yarn bombing collective located in Los Angeles, CA. The collective describe themselves as a group of guerrilla knitters who have been collaborating since 2010. They hold monthly meetings to develop plans for events, share techniques, develop their collective community, etc. They currently have 10+ projects in progress throughout the Los Angeles and nearby communities.
Yarn bombing has been under some scrutiny for the potential negative environmental impact that the yarn can have when placed on plant life. Yarn can restrict sap production on trees and constrict growth. It is considered proper yarn bombing etiquette to avoid "bombing" things like trees, bushes, and other plant life due to the negative impact it can have.
In Europe Knit the City: Maschenhaft Seltsames by Deadly Knitshade was published in February 2011 by Hoffmann und Campe in Germany. It was originally written in English, and was published by Summersdale in the UK in September 2011 as Knit the City: A Whodunnknit Set in London.
Yarn Bombing Los Angeles released a self-published catalog of an exhibit held at 18th Street Arts Complex, Santa Monica, CA in June 2011 titled Yarn Bombing 18th Street by Arzu Arda Kosar.
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- Anonymous (2009-01-21). "Knitters turn to graffiti artists with 'yarnbombing'". London: The Telegraph. Retrieved 2009-05-25.
- McGovern, Alyce (6 March 2014). "Knit one, purl one: the mysteries of yarn bombing unravelled". The Conversation. Retrieved 6 March 2014.
- Farinosi, Manuela; Fortunati, Leopoldina (April 2018). "Knitting Feminist Politics: Exploring a Yarn-Bombing Performance in a Postdisaster City". Journal of Communication Inquiry. 42 (2): 138–165. doi:10.1177/0196859917753419.
- Mann, Joanna (March 2015). "Towards a politics of whimsy: yarn bombing the city". Area. 47 (1): 65–72. doi:10.1111/area.12164.
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- "Collected Thread".
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- Mollins, Julie (2011-06-10). "Graffiti knitters to hit streets on Yarnbombing Day". Reuters. Retrieved 13 June 2011.
- Cooper, Arnie (March 8, 2015). "The Guerrilla Art of the Yarnbomb Goes Natural". Newsweek Magazine. Retrieved 10 December 2015.
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- "about". Yarnbombing Los Angeles. Retrieved 2018-04-17.
- Mann, Joanna (January 28, 2017). "Knitting the archive: Shetland lace and ecologies of skilled practice". Sage. 25: 91–106. doi:10.1177/1474474016688911.
- Prain, Leanne (2009). Yarn Bombing: The Art of Crochet and Knit Graffiti. Arsenal Pulp Press. ISBN 978-1-55152-255-5.
- Knitshade, Deadly (2011). Knit the City: Maschenhaft Seltsames. Germany: Hoffman und Campe. ISBN 978-3-455-38105-4.
- Knitshade, Deadly (2011). Knit the City: A Whodunnknit Set in London. London: Summersdale. ISBN 978-1-84953-179-5.
- "Foto's van Rosa Sosa". Facebook. Retrieved 2013-05-09.
- Kosar, Arzu (2012). Yarn Bombing 18th Street. CreateSpace Independent Publishing Platform. ISBN 978-1-47002-190-0.
|Wikimedia Commons has media related to Knitted graffiti.|
- Mandy Moore, Leanne Pain, Yarn Bombing, the Art of Crochet and Knit Graffiti, Arsenal Pulp Press, 2009
- Deadly Knitshade, Astrid Finke, Knit the City – Maschenhaft Seltsames, Hoffmann und Campe, Hamburg 2011, ISBN 978-3-455-38105-4.
- Langreiter, Nikola (2012), "Neues Handarbeiten – Radical? Revolutionary? Guerilla?", in Hannes Obermair; et al., Regionale Zivilgesellschaft in Bewegung - Cittadini innanzi tutto, Vienna-Bolzano: Folio Verlag, pp. 183–204, ISBN 978-3-85256-618-4CS1 maint: Explicit use of et al. (link)
- Lewis, Perri, Guide to Night: Mark Thomas joins the guerrilla knitters. The Guardian, 1 November 2009.
- Press Association, US town baffled by Midnight Knitter. Irish Independent, 11 March 2010.
- "Knitting but not as we know it", BBC News, Saturday 13 June 2009
- Costa, Maddy, "The graffiti knitting epidemic". The Guardian, 11 October 2010.
- 'Grandma Graffiti': German Knitting Guerillas Go Global, May 2011
- Knit Knot Tree, Do Trees Get Cold-offbeat knitting USA Today AP 11 March 2008
- foxtoledo.com Making Toledo a little more cozy: Yarn-Bombing phenomenon exploding in Toledo
- Milly, Jena (2011-06-22). "Yarn Bombing isn't Knit and Run Anymore". Huffington Post. Retrieved 27 February 2012.
- Streetspun Yarnbombing, Warm and Fuzzy - Yarn bombers leave colorful mark on city ToledoBlade Online 22 APR, 2012
- Urban Knitting, Un ponte di lana Romagna.com 10 March 2014
- Cooper, Arnie, Not Your Grandma's Crocheting ArtNews Magazine 18 Nov 2014
- Stewart, Ethan, Knitting Psychedelic Daydreams Santa Barbara Independent 11 Sept 2014