Growing Information. How to plant: Propagate by seed Germination temperature: 45 F to 85 F-Will germinate at soil temperatures as low as 40 F. Days to emergence: 4 to 7 Seed can be saved 3 years.Maintenance and care: Sow seeds indoors 6 to 8 weeks before average last spring frost.rowing Information. How to plant: Propagate by seed Germination temperature: 45 F to 85 F-Will germinate at soil temperatures as low as 40 F. Days to emergence: 4 to 7 Seed can be saved 3 years.