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Does salvias come back every year?
Herbaceous perennial salvias such as Salvia nemorosa and Salvia x sylvestris are hardy and come back year after year. Tender perennial salvias such as Salvia greggii can come back year after year but are not completely hardy and may need protection over winter.
Do you cut back salvias in winter?
Salvias can be pruned twice a year — once in the late fall or early winter and once in the early spring. It's also a good idea to cut off spent blooms and trim the plant after each flowering to prevent it from getting too leggy and woody.