Salvia need nutrients to properly grow, but sage plants don’t need much fertilizer, so long as you have prepared their soil well to begin with. In fact, over-fertilizing makes sage plants grow faster, but weakens the flavor—defeating the purpose of growing sage!
Test your soil: sage prefers soil with a pH of 6.0 to 6.7. When you first plant sage, work a 5-5-10 fertilizer into the soil at the rate of half a pound to 100 square feet. After that a little side dressing of compost or compost tea once or twice during the season will be enough to keep your sage plants nourished and happy. But honestly, you can even skip that step and your sage will flourish. It’s a very forgiving plant.
Do you fertilize your salvia? What type of fertilizer do you use? How often do you fertilize? Please tell us how and when you fertilize your sage plants.