This article is from the Rose Gardening FAQ, by Bill Chandler chandler@austin.ibm.com, Jolene Adams jolene@cchem.berkeley.edu, Brent C. Dickerson odinthor@csulf.edu, Karen Baldwin kbaldwin@veribest.com, and many contributors
Though highly sought after, no blue roses exist yet. Some roses are
advertised as blue, but they are actually lavender or something. Most
lavender roses are difficult to grow and are quite susceptible to disease.
Some of the bluer roses are Blue Girl, Blue Jay(HT), and Reine des
Violettes(HP). A couple of true purple roses are Cardinal de Richelieu and
Veilchenblau.
The genetics are just not there for producing a true blue color in roses. It
will probably be necessary to use gene splicing to produce the first blue
rose.
 
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