Hi
According to the "books" it is
S disermas that should smell like hay. But I don't have either
S disermas or
S desoleana so I can't say from experience.
I have had experience of
S clevlandii 'Allen Chickering' and
S clevelandii . I am now onto my 3rd year and 3rd plant.

The first 2 I kept in a pot and gave in to the temptation to water them over the summer. Fatal! I had read that summer watering was not the thing to do but seeing the poor things seemingly dying anyway I gave them a little water.
This year I dug up my
S 'Anthony Parker' to make room for
S 'Allen Chickering'. I wish I could have done it in autumn but that was when the S 'Anthony Parker' was in full flower. Of course, fate played a trick on me. Once I put the
S 'Allen Chickering' into the ground , a colony of ants decided to build their nest in the root ball! Let's hope for the best. S 'Anthony Parker' is very happy in his new large pot, by the way.
This site recommends some wartering over the summer. I am going to try without this year.
https://inlandvalleygardenplanner.org/plants/salvia-allen-chickering/Both
S clevelandii and the hybrid
S 'Allen Chickering' have beautifully fragrant foliage. But I found the
S clevelandii filled the garden with perfume whereas
S 'Allen Chickering" needs to be rubbed to release the scent.