To break dormancy, this seed needs stratification, a short period of cold moisture. Mix the seed with moist sand and store in the refrigerator for 30 days before planting. You can also direct sow unstratified seed on the surface of the soil in the fall for germination in the spring. Sow seeds indoors just beneath the surface of the soil 8-10 weeks before the last frost. Hyssop seeds will germinate in 14-21 days. Transplant out in the spring after the last frost. Set plants 12-24 inches apart It is used for a variety of purposes, including as a fragrance in cosmetics, a flavoring in foods, and as a medicinal herb for digestive and respiratory problems.