This is another I've had trouble with, Salvia guaranitica, Black and Blue Salvia. I saw it in full-blown glory in the WPA Rock Garden (William Land Park) several years ago. And, wanted it! Well, seems like every year I purchase one, mistreat it, and again, it dies in the can. I still want it, and so far, this one is still looking good. Salvias tend to be low water requiring plants, but until it's established in the garden it does need to be watered regularly. A few times I've neglected it and it starts drooping, but I've caught it before I caused permanent damage to its leaves (leaves dry up, no more energy production = dead). I also have it in a partially shady area, which it will prefer once I get it planted as well.
So... rather than quit when you kill a plant and label yourself a "Black Thumb", find out what you did wrong and keep at it. And, realize, you've "Joined the Club"
Whether you need garden design, coaching, seasonal maintenance or planting, Geno's Garden can help!
Call me at (916) 764-5243, or email firstname.lastname@example.org.