I was advised to use a large terracotta pot to cover them, which would avoid any condensation problems and also give you better insulation than a cloche.

I put a really large cloche over mine....home made from an old greenhouse. It seem to get them through the Scottish winter. The terracotta pot sounds a great idea Steragram......condensation is always a problem here in sunny Glasgow.

I have a Salvia Patens. I've read that they should be dug up at the first frost when the stems blacken and the tubers stored and treated as Dahlias. I did this last winter and stored it with my Dahlia tubers. The result was that the Dahlias survived but the Salvia died. So clearly that method isn't reliable. A Salvia Patens expert tells me he leaves his in the ground, mulches with 4" of leaf mould in November and lets the tops die off and they always come through even after a bad winter. I reckon I'll try that this time.

Mine came through the winter OK but something ate all the leaves off in the summer- are they especially susceptible to slug damage does anyone know?

Thank you all Salvia has come through winter and starting to grow. (Was a mild winter) will add bark mulch as well as plastic cloche next winter

No sign of mine...