How to Grow Potatoes in Containers in 8 Simple Steps How to Properly Plant Marigold Seeds for Spring How to grow giant cannabis plants in pure US style How to Grow Tomatoes from Seeds Park Seed String of Pearls 'Senecio rowleyanus' 2 Gal. Black Without Pot 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