Technically, this Salvia could be cut all the way back to the ground. This becomes more difficult as the plant ages so we prune them to between eight and twelve inches above the ground in late fall or early spring.
Maraschino Cherry Salvia has large lipstick red flowers that, like many Salvias, are exceptionally attractive to hummingbirds. They also makes a tasty garnish for a summer salad or brunch stir-fry. Try adding a handful to cornbread or pound cake. Chop slightly and add to butter or sour cream. Be sure to remove the bract (the flower petal holder). These can be tough and/or bitter.
This plant is often available in plug trays. These trays hold 128 of all the same plant. They are a great low cost way to fill a lot of space. Each cell is 3/4 of inch by an inch. Check here to see if Maraschino Cherry Salvia Plug Trays are available.