Nigella

Sow seed directly outdoors from March to May, or in September for earlier flowers the following year. Scatter thinly and rake in lightly — cover with no more than 5 mm of soil. Thin seedlings to 15-20 cm apart. Nigella has a delicate taproot and resents transplanting, so always sow where it is to grow. Choose a sunny or lightly shaded spot with well-drained soil. Water only during prolonged dry spells. No feeding is needed. The flowering period is relatively short — about four to five weeks — so make successional sowings at monthly intervals for a longer display. For dried seed pods, cut stems when the pods are fully formed but still green. Hang upside down in a cool, dry place. Allow some pods to remain on the plant for self-seeding. Nigella naturalises beautifully, reappearing year after year once established.

No pruning required. Leave attractive seed pods for dried arrangements and self-sowing. Pull up spent plants once they look untidy.