Sage is a perennial botany herb that is used for a variety of tasks, from creating culinary or massage oils, to repelling insects, to adding to dishes such as sausage or stuffing. It's even used in face creams. At maturity, sage can grow from 12 to 30 inches tall and about 2 feet in diameter. You can grow sage outdoors in USDA hardiness zones 5 to 9 or in a large pot that you can transfer indoors if conditions outside are too cold. The two best ways to grow sage are from seeds or cuttings.
Prepare the soil for planting in early spring. Make sure it is well-drained, rich soil with some loam content. If your region cannot accommodate a semitropical humid climate, grow the sage indoors in a terrarium or using a lid to cover the plant after watering to increase humidity.
Create a hole about 1/8 inch deep in the soil for seeds, with the holes about 3 inches apart. Place the seeds in the holes and cover lightly with dirt. For cuttings, wash away the agar substrate (the jelly substance) from the cutting before planting. Plant the cutting in a shallow hole about 1/3 inch deep, 4 inches apart for multiple cuttings. It will take a couple weeks to take root.
Water the seeds or cuttings generously so the dirt is moist at all times, especially during the first two weeks.
Transplant the sage seedlings once they are 4 inches tall. Sage roots grow quickly and spread outwards, so the plant needs to always be in a pot at least tree times the size of the plant. Spread the seedlings 2 to 3 feet apart when transplanting. After this point, water about once a week.
Prevent pest problems such as insects and slugs by spraying the plants down lightly with a hose to push them off.