Herboo nigella love-in-a-mist seeds likes
A sunny spot
They’ll grow in light shade, but you’ll get more flowers if you put them somewhere that gets full sun.
Moist soil
Keep the soil well watered to help the seeds germinate and grow. Especially important if growing in pots.
Deadheading
Pinch off wilted flowers to encourage new ones to replace them. Better yet, use the flowers in floral arrangements.