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1 If you decide to plant seeds, they should be planted in late spring (in a bed or in a container) about 1/8 inch deep and 24 to 30 inches apart. They will take 10 to 21 days to germinate.  However, ff you already have an established sage plant, you can use cuttings or layering techniques to grow a new plant.
For those who have problems keeping rosemary alive from one year to the next, and those who like to have lots of rosemary in the garden, growing the rosemary from seed each year is a practical option. The seed takes a while to germinate so you need to start it about three months before the warm weather arrives. Place the seed onto a well drained base such as sand, vermiculite or very light potting mix. Cover the seed with a little more mix, water lightly and place the container in a warm location or onto a heat mat.