Germination: Easy germination. Start indoors 2-4 weeks prior to last spring frost. Sow seed in container on good seed starting mix. Cover seeds lightly with mix. Moisten mix and keep mix moist until germination begins. Place container in a location at 70°F. Germination should begin in 6-10 days. Does not do well direct sown to garden location.
Soil temperature should be kept higher than 68°C / 154°F to ensure good germination.By our calculations, you should look at sowing Nagano about 77 days before your last frost date.