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At their most extravagant, the tendriled seed pods of the Nigella damascena flower resemble the curled necks of swans in a Tunnel of Love. Its fringed, quick-growing blooms have long appeared in English cottage gardens, and in southern Europe and North Africa, where the species grows wild. In the United States you can purchase a packet of its seeds—around 2,200 of them—for about $6.