In my own experience, scent is not always a reliable trait in roses. I speculate that fragrant roses tend to produce more delicious scent when they are lavished with good care because I tend not to do this and my own roses tend to disappoint a little in the scent department. But even while Don Juan was dying of black spot, I was able to detect a delicious spicy scent from its several flowers. Sometimes, I guess, it may just be luck.