I just finished a "cram and dent" test weave of silk and linen. I wanted the linen to bloom a bit, so I put the scarf in the washer on warm/cold and in the dryer - I think on the regular setting. It came out fine, no problem with the silk. That said, your mileage may vary as they say.
Unless something is very fragile or shrinkable, I try not to give it special treatment. Or, I watch it very carefully the first time and reduce the washing or drying times/temps and check it frequently.