In areas with a growing season shorter than 100 days, seeds should be started indoors. Some plants will be non productive but others will produce three or four heads per season. 9 weeks before the last frost date, plant two or three seeds to a 3 inch container. Seeds germinate in 10–5 days at a soil temperature of 70-75 degrees F (21-24 degrees C) After the first true leaves form, thin to one plant (the largest) per container. Four weeks before the last frost, transplant seedlings to 5 inch pots. Harden off for a week before planting outdoors in fertile, well drained soil allowing at least three feet around each plant. Choose a sheltered spot with full sun at the back of the garden where the plants can be allowed to become large without shading other plants or getting knocked over by wind. In mild areas they will over winter if they are hilled over and heavily mulched.