Eric, here's a pic of my Black and Blue. As you can see, it's clearly purple. In the plant world, what's often called a "blue bloom" is really purple. Tip; look for the words "true blue".
There are few plants that produce true blue blooms. The ones I know of are delphiniums, larkspurs, forget me nots, some muscari, some hyacinth, borage, echium and a few salvias. Despite the hype, there is no true blue rose.
