Erm, are you sure you mean salvia - only they're not bulbs?

Some produce a tuber a bit like a dahlia. and yes they are worth saving as they have a food store for growth next year. Like dahlias they need to be kept dry and frost free.

~Well you learn something every day!! I didnt know that they had tubers, although there are so many we tend to think of the scarlet sage type.

Yes they are tubers rather than bulbs,thanks for replies

Well I've learnt something today as well - I never knew that, Seaburngirl, thanks.

I've stored S.gaurantica "Black and Blue" successfully the last couple of winters. I've lifted my S.patens too this year.

Learn something new every day on this wonderful site, including the common name for s.gaurantica as just now discovered is the hummingbird plant ... wonderful!