Perhaps you missed the giggle inducing copy from The New York Times describing Lady Gaga’s Golden Globes gown as "lunar blue" rather than the seemingly obvious choice of periwinkle.  Like nurseryman's blue, we can argue if the color is more lilac than blue, but can agree this color is a dramatic departure from the usual bi-color patternation typical of the species.  Salvia glabrescens 'Lunar Blue' is a selection of a species we've long admired & been playing with from seed for years. She's a shade loving late bloomer --late Sept to Nov (depending where you are). This luminous color reflects blue to periwinkle as the fall sun tracks. Especially effective peppered (or carpeted, as shown on the red carpet) with scarlet Maple foliage. Averages 32’’ and hardy to at least Z5. Quart pot