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 Set of 3 Small Succulent Plant Pots Original Planter Gift ! Etsy Wild Rose Seed Packet Orange Climbing Rose Flower Seeds for Planting Heirloom Non GMO Garden Seeds How to Keep Chipmunks Out of Your Garden, According to Experts