Salvias are a very versatile family of plants, part of the sage family the leaves have that same distinctive smell. Some are fully hardy in the UK, some won’t survive the winter in the border but will if dug up and potted up in the greenhouse. To guarantee I have the ones I like every year I take cuttings in late summer, over winter them on the kitchen window ledge and from late Jan I start taking cuttings again. Three of my favourites are:
Amistad 
Nachtlinder 
Caradonna
I follow the same approach to all three. First off prepare the pot you are going to root them in; fill it with normal garden compost and prod holes in the compost around the edge of the pot to put the cuttings in. Get a clear plastic bag ready, I use (and reuse) sandwich bags. Cut healthy growing shoots that have a couple of good leaves but no flowering tip. The stem should be about 5 or 6cms at least and remove all bar one or two small leaves at the end of the stem. Dip the end of the stem in rooting powder, then place in the holes around the edge of the pot firming them in. Put the pot in the clear plastic bag, tie it shut and then leave it in a light spot.
Over wintered stock 
Typical shoot to chose 
Cuttings ready to trim 
Most leaves removed 
Potted and ready to go 
Bag sealed now leave in a light spot
In about a month I’ll open the bag and gently tip the pot to see if there are roots, if they have established healthily then I’ll pot them on. I’ll keep doing this every few weeks now until March so that I’ll have plenty of great plants for the summer!