Question: which salvias are hardy uk?
Answer: Salvia nemorosa 'Amethyst' (Sage) ... 
Salvia nemorosa 'Caradonna' (Sage) ... 
Salvia nemorosa 'Ostfriesland' (Sage) ... 
Salvia verticillata 'Purple Rain' (Whorled Sage) ... 
Salvia x sylvestris 'Blue Hill' ('Blauhugel' Sage) ... 
Salvia x sylvestris 'Mainacht' (Wood Sage)