30 seeds. Echinacea purpurea. Perennial.
 
Purple Conflower. Hardy perennial in zones 3–9. 
 
Height 36 inches. Spacing 18 inches.
 
Sowing Echinacea Seeds:
 
Soak seeds overnight. Start indoors 8 weeks before the last frost date. Or sow outdoors in early spring or fall. Sow 1/4 inch deep. Full sun to part shade.
 
Photo courtesy of Diane's Flower Seeds