I planted 4 salvia argentea in 2005. All four survived the winter and flowered the next year. I cut them back. In 2007, three survived and flowered. I cut them back after they finished flowering. This spring I have two left.

Those furry silvery leaves are so attractive - now I have four more sittng out in the driveway waiting to get planted.

Note that these have all been planted on a sandy, dry bank. When I tried them in the regular garden bed, they didn't survive the first winter.