Datura stramonium - aka Devil’s Trumpet. The white spiral trumpet flowers open in the evening, and by morning they have mostly closed back up. Following the blossoms, grow spiky seed pods. The pods are fascinating additions to dried arrangements, and they remain on the stalks in the garden for months, for late fall visual interest. 
 
Packet contains at least 10 seeds. The seeds were hand-cleaned by Simone, and will contain some chaff.