Salvia sclarea seems to be described as a biennial or short lived perennial.
I sowed some last year and they grew and coloured up well.
They didn't grow as tall as they had for me in England.
How long lived they would be I don't know, because as soon as it became hot, they became unsightly and I pulled them up.
They are fine for a short term, spring/early summer display, but they don't like the heat.
Daisy