Start seed indoors in a soil-less mix 8-12 weeks before the last frost date in your area. Sow the seed 6 mm (1/4″) deep and germinate at 21-26 C (70-80 F). When seedlings are 2.5-5 cm (1-2″) high transplant to individual 10 cm (4″) pots and grow on at 15-21 C. Harden off and transplant to the garden after the threat of frost has passed. Artichoke does best in full sun with a deep, organic, fertile soil. Space plants 60-90 cm (24-36″) apart in the row with rows 1.75 m (6′) apart. Keep plants evenly watered and mulch the soil to help preserve soil moisture and keep the soil from becoming too warm in summer.  If the soil does become too warm, it can trigger a summer dormant period. Start with a thin layer of mulch and build it up to 10 cm (4″) thick as the plants grow.