Certified Organic Rosemary Seed (100ct) 2018 seed Certified Organic Rosemary Seed certified by Baystate Organic Certifiers. Rosemary is a wonderful herb that is popular as both a garden herb and a culinary favorite. Unfortunately for those who live in the cooler zones (zone 6 and lower), rosemary is not winter hardy so it has to be treated as an annual or you have to bring the herb inside for the winter and try to keep it alive - which is not easy. 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.