50 seeds. Asclepias tuberosa. Perennial.
 
Also known as Butterfly Weed and Butterfly Milk Weed.
 
Hardy to zones 4 to10.
 
Height 24 inches. Spacing 12 inches. 
 
Sowing Asclepias tuberosa Seeds
 
Start seeds indoors in late winter. Barely cover with soil, then refrigerate for 3 weeks. Or sow outdoors in the fall. Full sun.
 
Photo courtesy of Diane's Flower Seeds