Salvia is a great choice to keep your garden going into late summer and early fall. I deadhead all of these with the exception of the pink annual Salvia. The annual will keep going until November some years. I hadn't realized how many of my latest bloomers are Salvias. These photos were taken in early September. The lead photo has three salvias:
peachy pink annual Salvia (it re-seeds each year), hot pink Salvia greggii, and Salvia Black and Blue sage.
White perennial Salvia
Purple blue perennial Salvia
Black and Blue Sage (Salvia) A frequently referenced plant on this blog.