Nigella damascena
May be propagated by sowing their seeds upon a bed of light earth, where they are to remain (for they seldom succeed well if transplanted); therefore, in order to have them intermixed among other annual flowers in the borders of the Flower Garden, the seeds should be sown in patches at proper distances; and when the plants come up, they must be thinned where they grow too close, leaving but three or four of them in each patch, observing also to keep them clear from weeds, which is all the culture they require. In July they will produce their flowers, and their seeds will ripen in August.
- The Botanical Magazine, Volume 1