Removing seed pods. YouTube Nigella is one of those flowers that actually prefers the cool soil of early spring. In Zone 6b, I start sowing my nigella seeds in late winter and continue sowing through early NZND Plastic Pots for Indoor Outdoor Plants, Garden Seedling Nursery Planter, 1 2.2 3.2 Gallon, White Walmart.com Wild Rose Seed Packet Orange Climbing Rose Flower Seeds for Planting Heirloom Non GMO Garden Seeds