Russian sage (Perovskia)
Should I cut this back after the summer? How far?
Russian sage should be cut back just before leafing out next spring. You will be able to see buds starting to swell. Cut back to 6 inches, making sure there are several live buds left on the stem. Large, budless stems should be cut to the ground. Since it can get tall and a bit floppy, some recommend cutting again to 6 inches when the plant is 12 inches tall. The trimmings are good deer/rabbit repellant. I place them over emerging tulips.