For knowing the answer you must sow ! Try and good luck.

dirtface:
Give them a try keep in mind most Salvia seed germinates
@ a soil temp of 70.Plant them soon your soil may be there already.
Art

If you keep them very cool, in a refrigerator, they can be viable for many years. (I knew someone who was looking at a herbarium specimen of a Salvia, this was at least 30 years old, and some seeds from the specimen "accidentally" jumped into her handbag! These germinated!)