Self Watering Pots with Clear Insert for Root Monitoring 46 Inch 5 Pack Rareplantninja Safe for cats? : r succulents Mother's Day Flower Pot Craft Miss Jacobs Miss Jacobs Little Learners How to grow black walnut from seed? 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