Propagation from seeds
When growing a perennial herb from seeds, it is always recommended you start indoors, in well-drained pots and transplant the seedlings outside once they are hard enough to handle. Take a small pot and fill it with rich soil, a mix of soil, compost and sand, leaving headspace of 2 to 3 inches to facilitate watering. Sprinkle the seeds on the surface of the pot and cover them with a thin layer of soil. Water the pot and make sure it is not left under direct sunlight. Keep the soil moist until the seeds germinate, and move your seedlings outside after the last frost.
Propagation from cuttings
Take cuttings from well grown herbs using a sharp garden shear or a razor blade. Remove last leaves near the cut end using a sharp knife or pair of scissors. Dip the cutting in the rooting powder and plant it in a pot containing an even mix of perlite and sand. Water the cuttings regularly until you observe new growth in about 18 to 21 days, then transplant them to individual pots. Move the cuttings outside only after their root system has established properly.