Since I was asked, yes I have Salvia 'Black and Blue'. I actually have it in a couple spots in my garden. I keep meaning to move the one and it keeps not happening. Mine are in half-shade, I guess? They get shaded most of the day with afternoon sun. I also have volunteers popping up but I thought they were self-seeding. I haven't pulled any in a long time so I can't remember if they were their own plants or spread by underground runners. As for cold hardiness, they die back to the ground each year but keep coming back in the spring.
I really like the looks of this Salvia but I can't say I see butterflies using it. Even the bees seem to like 'Mystic Spires' better. I think this Salvia's flowers are too tubular for most butterflies. They prefer the simple red and pink ones you can find at the big bix stores. As for the hummingbird, I haven't seen it on this Salvia but that may be because I can't keep it off my firebush.
