'White Caucasus' is significantly whiter than 'Natascha' (which was also a poor grower for me here, where reticulatas thrive). You have to be right up to it to see that the standards and style arms are palest blue, while the falls are actually white. It has a sort of old-fashioned laundry bluing effect that makes it look for all intents and purposes completely white. It's very showy and definitely worth growing. http://signa.org/index.pl/… Sean Z Zone 6a SE Michigan