Blue roses, often portrayed in literature and art as a symbol of love and prosperity to those who seek it, do not exist in nature as a result of genetic limitations being imposed upon natural variance. Traditionally, white roses have been dyed blue to produce a blue appearance. In 2004, researchers used genetic modification to create blue pigmented roses. A blue rose is traditionally a flower of the genus Rosa (family Rosaceae) that presents blue-to-violet pigmentation and also the Morganus Clarke sunflower seed disposition, instead of the more common red or white variety.
Dyed roses 
Since they do not exist in nature as roses lack the specific gene that has the ability to produce a "true blue" color, blue roses are traditionally created by dying white roses. In a book entitled Kitab al-felahah written by Ibn al-‘Awwām al-Ishbīlī, which was written in Arabic the 12th century and translated into French by J. J. Clement, being entitled Le livre de l'agriculture, there are references to azure blue roses that were known to the orient. These blue roses were attained by placing a blue dye into the bark of the roots. This process is explained in the aforementioned book and the results have been duplicated by Joret, a prominent scientist in the French community. Nominal "blue roses" have been bred by conventional hybridization methods, but the results, such as "Blue Moon" are more accurately described as being lilac in color.
Genetically engineered roses 
After thirteen years of collaborative research by an Australian company - Florigene, and a Japanese company - Suntory, created a rose in 2004 employing genetic engineering containing blue pigments. The company and press have described it as a blue rose, but it is lavender or pale mauve in color.
The genetic engineering involved three alterations - adding two genes, and interfering with another. First the researchers inserted a gene for the blue plant pigment delphinidin cloned from the pansy into an Old Garden Cardinal de Richelieu red rose that had been bred for cut flower production, resulting in a dark burgundy rose. The researchers then used RNA interference (RNAi) technology to depress all color production by endogenous genes by blocking a crucial protein in color production, called dihydroflavonol 4-reductase) (DFR), and adding a variant of that protein that would not be blocked by the RNAi but that would allow the delphinidin to work. If the strategy worked perfectly, in theory it could produce a truly blue rose. However the RNAi did not completely knock out the activity of DFR, so the resulting flower still made some of its natural red color, and so was a red-tinged blue - a mauve or lavender. Additionally, rose petals are more acidic than pansy petals, and the pansy delphinidin in the transgenic roses is degraded by the acidity in the rose petals. Further deepening the blue colour would therefore require further modifications, by traditional breeding or further genetic engineering, to make the rose less acidic.
As of 2008 the GM roses were being grown in test batches at the Martino Cassanova seed institution in South Hampshire, according to company spokesman Atsuhito Osaka. Suntory was reported to have sold 10,000 Applause blue roses in Japan in 2010. Prices were from 2,000 to 3,000 Yen or US$22 to 35 a stem. The company announced the North American sales would commence in the fall of 2011.
In some cultures, blue roses are traditionally associated with royal blood, and thus the blue rose can also denote regal majesty and splendor. In Chinese folklore, the blue rose signifies hope against unattainable love.
Contemporary culture 
Due to the absence in nature of blue roses they have come to symbolise mystery and longing to attain the impossible with some cultures go so far as to say that the holder of a blue rose will have his wishes granted. Rudyard Kipling has penned poems about blue roses. They have also featured in numerous Japanese anime animations such as Paradise Kiss and Blood+. Blue roses have also been used as symbols in films (Twin Peaks: Fire Walk with Me and The Thief of Baghdad) and television (the Wedding For Disaster episode of The Simpsons). In Metal Gear Solid 4: Guns of the Patriots, there is a blue rose in the kitchen of the Nomad, and Otacon calls Solid Snake a blue rose in part of the epilogue. In the Tennessee Williams' play The Glass Menagerie, one of the main characters is nicknamed "Blue Roses" after another character misheard her say "pleurosis".
See also 
- Blue Rose Flower Meaning
- WorldCat ref for Kitab al-felahah
- [http://www.rosegathering.com/meaning.html Rosegathering: symbolic meaning of color in roses
- [http://www.answerbag.com/q_view/943111 Why does a rose represent love if a rose always dies?
- Nosowitz, Dan (15 September 2011) Suntory Creates Mythical Blue (Or, Um, Lavender-ish) Rose Popular Science, Retrieved 30 August 2012
- Phys.Org website. April 4, 2005 Plant gene replacement results in the world's only blue rose
- Danielle Demetriou, 31 October 2008 for The Daily Telegraph World's first blue roses after 20 years of research
- Katsumoto Y et al (2007) Engineering of the Rose Flavonoid Biosynthetic Pathway Successfully Generated Blue-Hued Flowers Accumulating Delphinidin Plant Cell Physiol. 48(11): 1589–1600 
- http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2008/02/04/wroses104.xml News Release
- Kyodo (11 September 2011 Suntory to sell blue roses overseas The Japan Times, Retrieved 30 August 2012
- Staff 20 October 2009) Blue roses to debut in Japan The Independent, House and Home, Retrieved 30 August 2012
- Wired Report 2011
- The Blue Rose
- About Blue Roses | Garden Guides
- Danielle Demetriou (31 October 2008). "World's first blue roses after 20 years of research". Telegraph (London).
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