Nigella.
This is one of the most beautiful annuals there is, and its charming English name is Love-in-a-mist. Be sure to get the variety called Miss Jekyll, after the celebrated gardener. The flowers are a delicate yet vivid blue, surrounded by fennel-like leaves. They are easy to arrange for the room, and last well in water. The seed may be sown in March to bloom in June, and again in April or May for a later display. The seed-pods that succeed the flowers are ornamental, and those that ripen early in the summer sow themselves and flower in the following year. Some people say they can transplant Nigella, but many gardeners prefer to sow it where it is to stand. Thin out when the plants can be handled, as each one left, if well grown, will cover a square foot.