There are over 900 types of salvia plants, from "salvia divinorum," whose leaves are often used as a hallucinogen, to "salvia sinaloensis," which is often planted in butterfly gardens. Salvia plants thrive in full sun, and are most often found growing in warm climate zones, although in more temperate climates it can be grown indoors. The fact that salvia is a full-sun loving plant is why you must pay attention to the moisture content of the soil, especially when the plants are still young seedlings.
Water the seedlings to keep the small seedling pots moist, but not wet. Soil that is too wet can cause root rot. Salvia seedlings also like humidity, so if they are still very young use a plant mister to moisten the air around the plants. If you do not have a plant mister, create a dome for the seedlings by following step 2.
Create a greenhouse effect for the young salvia seedlings by making a dome over them with a clear plastic bag. Make sure the bag is not touching the plants. This dome will help trap in moisture, and will eliminate the need for misting.
Soak the soil when you move your seedlings to a larger pot or garden site. Be sure that the pots and gardens have good drainage so that the salvia does not become waterlogged.
Water weekly with a thorough soaking once you have transplanted your seedling. If your growing area is experiencing extremely hot weather or drought conditions, water every two to three days; otherwise, follow a schedule of watering once per week. As the salvia grows, keep the soil moist to slightly dry, never waterlogged.