These salvias are very simple to prune. When these types of Salvias are through flowering, simply cut those stems all the way down to the ground. It needs to be done once or twice a year. They will still flower next season if you don't, but you'll get more blooms and the plant will look 100% better if you do.

How do you prune salvias for the winter?

Prepare the salvia for winter by locating the basal foliage, which is the circular cluster of leaves on the ground. The salvia's flower stalks grow out of it. Snip all of the remaining stems right above these leaves. After trimming the stalks, only the leaves and possibly a small amount of stalk should remain.

How do you cut back salvias?

You will need to prune these plants twice: first in spring and then in July. For the spring trim, make the cut quite low down and remove any dead from the winter. Make sure shoots are visible from below where you make the cut. The second 'Hampton Hack' in July (see video below) can be done with sheers or secateurs.