Once the danger of frost has passed, you can sow salvia seeds directly into your garden soil around early to mid-spring (depending on your hardiness zone).
How to Plant Salvia
Salvia is relatively easy to plant. You can sow salvia directly outside in your garden soil if the conditions are right. For planting salvia in your own garden, check the following steps:
Choose a site. Salvia plants prefer full sun. Pick a site in your garden that gets at least six hours of sunlight per day.
Prepare the soil. Salvia plants need well-draining soil with a slightly acidic pH between 5.5 and 6.5. Adding a layer of mulch to the area can help protect the plant’s roots and retain moisture.
Loosen the soil. Loosen the soil to about a foot deep to give salvia’s root system ample space to grow.
Sow. Spread the seeds out evenly on the topsoil of the designated planting area. Lightly cover the seeds with soil.
Transplant. If you are transplanting salvia plants from containers into your garden, dig a hole twice the diameter of the container. Carefully place the root ball into the planting hole, so that only the top of it is level with the surface soil. Place each of these plants one to three feet apart, depending on the variety you’re growing.