Cover seeds lightly. In the South, allow 10 weeks for pack sales and 12 weeks for 4" pot production. In the North, 11 weeks for packs and 13 weeks for pots. Daylength sensitive, Dahlias sown in January or February flower naturally, but those sown later must be shaded for 10-hour days. Perennial in parts of the South; grown as an annual elsewhere.