Plant your poppies when it's cold! Poppy seeds require a period of cold to germinate and grow, so they generally do best when planted in the late fall or early spring. Ferry Morse Online Edition 1.8g Sunflower American Giant Hybrid Seeds Why smart gardeners start their dahlias in pots first BBC Gardeners World Magazine Garland Giant Garden Tray Mini Succulent Arrangement Just Succ It Flower Femmes Wildflower Seed Packet Rye & Co.