My Pandora's Box definitely starts out slightly peachy then bleaches out to a nice white. I have her in a terrible spot, in the way back of a garden, with taller things in the front. This might be a good year to dig her out and put her somewhere that's a better fit for her size. She does ok back there, not amazing, too much competition from the thread leaf Coreopsis ( although they look pretty together). PB blooms EM in my garden, late June into early July.
In the last photo, you can see PB behind the much taller Alnilam