Calgene Pacific spent over a decade and many millions of dollars "splicing" the gene responsible for blue pigments from petunia into a rose. They've also accomplished it with Carnations and other flowers with some odd results. The sole commercial rose result is the florist rose, "Applause", which is not "blue" but lavender. (And, no, you shouldn't try obtaining a bloom and attempting to breed with it. There ARE marker genes which will show up if the offspring are DNA tested and I can imagine they will very likely hit you hard for patent infringement. You don't spend this kind of time and money on something you won't police.) It was initially introduced as a florist rose in Japan where the national aesthetic appreciates the Human manipulation of Nature (think bonsai trees, cubed and other shaped fruit and vegetables, etc.) where its introductory price was $35 a STEM. It was popular as it could be given and the recipient would appreciate the cost and work entailed in creating the product. Receipt of the flower was an honor bestowed upon the recipient. But, again, it is NOT "blue". The "little blue gene" exists in the flower but they discovered the pH of the plant and flower are too alkaline for the blue pigments to express themselves, so IF it's worth their time and money, they will need to spend who knows how much longer trying to figure out how to change the underlying pH of the entire rose plant so the inserted petunia gene can express blue. Here is the Suntory article about the nearly two decades they've spent trying to create the "blue rose".
https://www.suntory.com/sic/re...
