Love-in-a-Mist, nigella damascene, is a fun little annual. I’ve grown it ever since Baker Creek included a bonus seed pack with my order a few years ago. The leaves are lacy, the flowers come in shades of blue, pink, and white, and the seed pods are great! It is super easy to grow from seed and autumn is prime time to collect seeds for next year. Most gardeners will happily share a few seed pods if you ask nicely.
I usually plant Love-in-a-Mist in the spring after most of the frosts have passed. I rough up the soil surface a little and scatter the seeds on top. Next I gently pat the seeds down to make contact with the soil and give them a little water. Then I forget about them for a month or so until the daffodils and other bulbs fade and I notice the ferny leaves. You can trim off faded blooms but I think the seed pods are just as cool. An alternate name for this plant is "devil in a bush", probably referring to the crazy looking pods.
To save seeds for next year, crack open the dry seed pods and tap the little black seeds into an envelope. You can also just scatter the seeds in the fall and they will usually show up next year. These are great filler flowers, are easy to pull up, and won’t crowd other plants out so you don’t have to be a control freak about placement. These are planted in my vegetable bed.