There is no blue pigment in a rose, so it is impossible for a natural rose to display this color. The tone has to be put into the plant. It has been done by genetically splicing color into the rose from Petunias. This flower has a blue pigment called Delphinidin. The combined project by both Japanese and Australians has taken twenty years to create the "blue" rose.
American nurseryman Samuel Parsons said as long ago as the 19th century that one day scientific advances would lead to the cultivation of a blue rose. Attempts have been made in the 20th century. A blue-grey rose was bred, but it flowered only once.
For many years roses dyed blue have sold well in England. Unfortunately, horticultural advisor to the Royal Horticultural society, Helen Bostock, believes a blue rose will not be accepted. She is probably wrong about this. People are fascinated by anything new. It is probably "sour grapes" that the blue rose was not created in England. Another English rose grower Bernard Mehring is a bit miffed as well. He says he wouldn't grow it in his garden. He wants British controls to keep the plant out of the country. This is a sad situation that wreaks of elitism. China, however, will want the new rose because there a blue flower signifies hope toward reaching an unattainable love.